harmala alkaloid

alkaloid beta-carbolines

alkaloid beta-carbolines Show first 5 Terms

(-)-7-bromohomotrypargine (1R)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1'-(cyclohexylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-(cyclopropylmethyl)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-(cyclopropylmethyl)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide ... Show All 818 Terms

(-)-7-bromohomotrypargine (1R)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1'-(cyclohexylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-(cyclopropylmethyl)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-(cyclopropylmethyl)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-[(2,5-difluorophenyl)methyl]-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1'-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-[(4-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-[1,3-benzodioxol-5-yl(oxo)methyl]-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1'-[2-(dimethylamino)-1-oxoethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-[cyclopentyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-1'-[(3-methoxyphenyl)methyl]-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-1'-[1-oxo-2-(3-pyridinyl)ethyl]-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-1'-[4-oxanyl(oxo)methyl]-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyrazinyl)methyl]-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyrazinyl)methyl]-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(3-pyridinyl)methyl]-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-N-propan-2-yl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-(1-oxobutyl)-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-(2-methoxy-1-oxoethyl)-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-(phenylmethyl)-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-[(3-methoxyphenyl)methyl]-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-[(3-methoxyphenyl)methyl]-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-[2-(4-morpholinyl)-1-oxoethyl]-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-[4-oxanyl(oxo)methyl]-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-N-phenyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-methylsulfonyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-N-propyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-1'-(2-thiazolylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-2-(3-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-1'-(3-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-(2-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-1-(hydroxymethyl)-7-methoxy-N-(4-methoxyphenyl)-2-[2-(4-morpholinyl)-1-oxoethyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-(1,3-benzodioxol-5-ylmethyl)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-(2-cyclopropyl-1-oxoethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-(cyclopentylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-phenyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-2-(cyclopropylmethyl)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-2-(cyclopropylmethyl)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-(cyclopropylmethyl)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-[(3,5-dimethoxyphenyl)methyl]-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-2-[(3,5-dimethoxyphenyl)methyl]-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-2-[(4-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-[(4-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-2-[cyclobutyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-N-(4-methoxyphenyl)-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-acetyl-1-(hydroxymethyl)-7-methoxy-N-(4-methoxyphenyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-2-acetyl-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-acetyl-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-2-benzoyl-1-(hydroxymethyl)-7-methoxy-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(1,3-benzodioxol-5-yl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(1,3-benzodioxol-5-yl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(1,3-benzodioxol-5-yl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(2-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(2-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(2-methoxy-1-oxoethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-(1-oxo-2-phenylethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(3,5-dimethyl-4-isoxazolyl)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3,5-dimethyl-4-isoxazolyl)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-oxanylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-2-(1-oxopropyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(3-methylphenyl)sulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-oxanylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-(phenylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-[oxo(3-pyridinyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(1-oxobutyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-thiazolylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(pyridin-4-ylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[2-(4-morpholinyl)-1-oxoethyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(1-oxo-2-pyridin-4-ylethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(2-thiazolylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-methylphenyl)sulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-oxanylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-oxanylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[(1-methyl-4-imidazolyl)sulfonyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[(5-phenyl-3-isoxazolyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyridinyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyridinyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(1-oxo-2-pyridin-4-ylethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(3-methylphenyl)sulfonyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[2-(4-morpholinyl)-1-oxoethyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(3-pyridinyl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-(4-fluorophenyl)-2-[(4-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-cyclohexyl-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N-cyclopentyl-1-(hydroxymethyl)-7-methoxy-1'-(2-methoxy-1-oxoethyl)-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-cyclopentyl-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1R)-N-cyclopentyl-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1R)-N1'-(1,3-benzodioxol-5-yl)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxyspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1R)-N1'-(3,5-dimethyl-4-isoxazolyl)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methylspiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1R)-N1'-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N2-propylspiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1R)-N1'-cyclopentyl-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methylspiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1R)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-N1'-propylspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1R)-N2-cyclopentyl-N1'-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxyspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1R*,3R*,3'S*)-1,2,3,4-Tetrahydro-1-(2-thio-3-pyrrolidinyl)-beta-carboline-3-carboxylic acid (1R,3S)-2-(2-chloro-1-oxoethyl)-1-(4-methoxycarbonylphenyl)-1,3,4,9-tetrahydropyrido[3,4-b]indole-3-carboxylic acid methyl ester (1S)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1'-(cyclohexylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-(cyclopropylmethyl)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-[(2,5-difluorophenyl)methyl]-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-[(2,5-difluorophenyl)methyl]-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1'-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1'-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-[(4-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-[1,3-benzodioxol-5-yl(oxo)methyl]-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1'-[2-(dimethylamino)-1-oxoethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-[cyclopentyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-1'-[(3-methoxyphenyl)methyl]-9-methyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-1'-[1-oxo-2-(3-pyridinyl)ethyl]-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-1'-[4-oxanyl(oxo)methyl]-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyrazinyl)methyl]-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyrazinyl)methyl]-N-propyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(3-pyridinyl)methyl]-N-propan-2-yl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-N-propan-2-yl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2-(1-oxobutyl)-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2-(2-methoxy-1-oxoethyl)-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2-[(3-methoxyphenyl)methyl]-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2-[2-(4-morpholinyl)-1-oxoethyl]-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2-[4-oxanyl(oxo)methyl]-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-N-phenyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(4-oxanylmethyl)-N-propan-2-yl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-methylsulfonyl-N-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-N-propyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-1'-(2-thiazolylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-2-(2-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-2-(3-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-1'-(3-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-2-(2-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-N-(4-methoxyphenyl)-2-[2-(4-morpholinyl)-1-oxoethyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-1-(hydroxymethyl)-7-methoxy-N-propyl-1'-(2-thiazolylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-(2-cyclopropyl-1-oxoethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-(2-cyclopropyl-1-oxoethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-(cyclopentylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N-phenyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-(cyclopropylmethyl)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-(cyclopropylmethyl)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-[(3,5-dimethoxyphenyl)methyl]-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-[(3,5-dimethoxyphenyl)methyl]-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-N-propan-2-yl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-[(4-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-N-propan-2-yl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-[(4-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-[cyclobutyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-N-(4-methoxyphenyl)-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-acetyl-1-(hydroxymethyl)-7-methoxy-N-(4-methoxyphenyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-2-acetyl-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-acetyl-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-2-benzoyl-1-(hydroxymethyl)-7-methoxy-N-propyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(1,3-benzodioxol-5-yl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(1,3-benzodioxol-5-yl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(2,4-difluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(2-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(2-methoxy-1-oxoethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-(1-oxo-2-phenylethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(2-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3,5-dimethyl-4-isoxazolyl)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3,5-dimethyl-4-isoxazolyl)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-oxanylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3,5-dimethyl-4-isoxazolyl)-1-(hydroxymethyl)-7-methoxy-2-(1-oxopropyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(3-methylphenyl)sulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-(phenylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-2-[oxo(3-pyridinyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(1-oxobutyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-thiazolylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(pyridin-4-ylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[2-(4-morpholinyl)-1-oxoethyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[4-oxanyl(oxo)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(4-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1'-[(2-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(1-oxo-2-phenylethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-(4-methylphenyl)sulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[(1-methyl-4-imidazolyl)sulfonyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[(5-phenyl-3-isoxazolyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyridinyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(1-oxo-2-pyridin-4-ylethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(3-methylphenyl)sulfonyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[2-(4-morpholinyl)-1-oxoethyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(3-pyridinyl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-(4-fluorophenyl)-2-[(4-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-cyclohexyl-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-cyclopentyl-1-(hydroxymethyl)-7-methoxy-1'-(2-methoxy-1-oxoethyl)-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-cyclopentyl-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N-cyclopentyl-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]carboxamide (1S)-N-cyclopentyl-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]carboxamide (1S)-N1'-(1,3-benzodioxol-5-yl)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxyspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1S)-N1'-(1,3-benzodioxol-5-yl)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxyspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1S)-N1'-(3,5-dimethyl-4-isoxazolyl)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methylspiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1S)-N1'-(3,5-dimethyl-4-isoxazolyl)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxyspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1S)-N1'-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-N2-propylspiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1S)-N1'-cyclopentyl-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-9-methylspiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]-1',2-dicarboxamide (1S)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-N1'-phenylspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1S)-N2-(4-fluorophenyl)-1-(hydroxymethyl)-7-methoxy-N1'-propylspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1S)-N2-cyclopentyl-N1'-(3-fluorophenyl)-1-(hydroxymethyl)-7-methoxyspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1',2-dicarboxamide (1xi,3S)-1,2,3,4-Tetrahydro-1-methyl-beta-carboline-1,3-dicarboxylic acid (1xi,3xi)-1,2,3,4-Tetrahydro-1-methyl-beta-carboline-3-carboxylic acid (2-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (2-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-2-methyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (2-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(phenylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (2-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(phenylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (2S,4R)-4-(9H-Pyrido[3,4-b]indol-1-yl)-1,2,4-butanetriol (3-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (3-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (3-fluorophenyl)-[(1R)-2-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (3-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (3-fluorophenyl)-[(1S)-2-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (3S)-1,1-dimethyl-2,3,4,9-tetrahydropyrido[3,4-b]indole-3-carboxylic acid (3S)-2-(2-chloro-1-oxoethyl)-1,1-dimethyl-4,9-dihydro-3H-pyrido[3,4-b]indole-3-carboxylic acid methyl ester (4-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(3-pyridinylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-thiophen-2-ylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(4-oxanylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (4-fluorophenyl)-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-(3-pyridinylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-thiophen-2-ylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone (4-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(4-oxanylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone (4-fluorophenyl)-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone 1,2,3,4-Tetrahydro-beta-carboline-1,3-dicarboxylic acid 1,3-benzodioxol-5-yl-[(1R)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone 1,3-benzodioxol-5-yl-[(1R)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone 1,3-benzodioxol-5-yl-[(1S)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone 1,3-benzodioxol-5-yl-[(1S)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone 1,3-benzodioxol-5-yl-[(1S)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone 1-(1,2,3,4,5-Pentahydroxypent-1-yl)-1,2,3,4-tetrahydro-beta-carboline-3-carboxylate 1-(1,3-benzodioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid 1-(9H-Pyrido[3,4-b]indol-1-yl)-1,4-butanediol 1-[(1R)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-1'-(cyclohexylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(2-pyridinyl)ethanone 1-[(1R)-1'-(cyclopentylmethyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(4-morpholinyl)ethanone 1-[(1R)-1'-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(dimethylamino)ethanone 1-[(1R)-1'-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-1'-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1R)-1'-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-1'-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-1'-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1R)-1'-[(4-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1R)-1'-[1,3-benzodioxol-5-yl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-1'-[cyclopropyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-1'-acetyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1R)-1'-benzoyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-cyclopropylethanone 1-[(1R)-1'-benzoyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-cyclopropylethanone 1-[(1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(2-pyridinyl)ethanone 1-[(1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-phenylethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(2-pyridinyl)ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(2-thiazolylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(phenylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(4-morpholinyl)ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(phenylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-[(2-methoxyphenyl)methyl]-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-[(5-phenyl-3-isoxazolyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-phenylethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(3-pyridinyl)ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(4-morpholinyl)ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(2-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(3-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(3-pyridinyl)ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[(2-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[(4-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-pyridin-4-ylethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[(4-methoxyphenyl)methyl]-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[1-oxo-2-(2-pyridinyl)ethyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(1-oxo-2-phenylethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(3-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(phenylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(pyridin-4-ylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(4-morpholinyl)ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(2-pyrazinyl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(2-pyridinyl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-methylsulfonyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(2-thiazolylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(pyridin-4-ylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-pyridin-4-ylethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[oxo(2-pyrazinyl)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[oxo(2-pyridinyl)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-phenylethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[oxo(pyridin-4-yl)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-2-(1,3-benzodioxol-5-ylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-2-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1R)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(dimethylamino)ethanone 1-[(1R)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1R)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1R)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1R)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1R)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(dimethylamino)ethanone 1-[(1R)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-cyclopropylethanone 1-[(1R)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-cyclopropylethanone 1-[(1R)-2-[(2-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-2-[(2-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-2-[(3,5-dimethoxyphenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(4-morpholinyl)ethanone 1-[(1R)-2-[(3-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1R)-2-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-2-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1R)-2-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-phenylethanone 1-[(1R)-2-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1R)-2-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1R)-2-[(4-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-2-[cyclopentyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1R)-2-[cyclopentyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-cyclopropylethanone 1-[(1R)-2-[cyclopropyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(dimethylamino)ethanone 1-[(1R)-2-acetyl-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(4-morpholinyl)ethanone 1-[(1R)-2-acetyl-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1R)-2-acetyl-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1S)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-1'-(cyclopentylmethyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(4-morpholinyl)ethanone 1-[(1S)-1'-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(dimethylamino)ethanone 1-[(1S)-1'-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1S)-1'-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1S)-1'-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-1'-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1S)-1'-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1S)-1'-[(4-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1S)-1'-[1,3-benzodioxol-5-yl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-1'-[cyclopropyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1S)-1'-acetyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1S)-1'-benzoyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-cyclopropylethanone 1-[(1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(2-pyridinyl)ethanone 1-[(1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-phenylethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-(2-thiazolylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-(phenylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-[(2-methoxyphenyl)methyl]-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-[(5-phenyl-3-isoxazolyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-phenylethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(4-morpholinyl)ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(3-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(3-pyridinyl)ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-[(2-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-[(4-methoxyphenyl)methyl]-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-[1-oxo-2-(2-pyridinyl)ethyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(1-oxo-2-phenylethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(3-pyridinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(phenylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(pyridin-4-ylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(4-morpholinyl)ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[4-oxanyl(oxo)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(2-pyrazinyl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(2-pyridinyl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-methylsulfonyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-propyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(4-morpholinyl)ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(2-thiazolylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(pyridin-4-ylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-pyridin-4-ylethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[oxo(2-pyrazinyl)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[oxo(2-pyridinyl)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-phenylethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-[oxo(pyridin-4-yl)methyl]-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-2-(1,3-benzodioxol-5-ylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-2-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-propanone 1-[(1S)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(dimethylamino)ethanone 1-[(1S)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1S)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1S)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-2-methoxyethanone 1-[(1S)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-cyclopropylethanone 1-[(1S)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-cyclopropylethanone 1-[(1S)-2-[(2-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-2-[(3,5-dimethoxyphenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(4-morpholinyl)ethanone 1-[(1S)-2-[(3-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-propanone 1-[(1S)-2-[(3-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-2-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-2-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-methoxyethanone 1-[(1S)-2-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-phenylethanone 1-[(1S)-2-[(4-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[(1S)-2-[(4-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-1-butanone 1-[(1S)-2-[cyclopentyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-2-cyclopropylethanone 1-[(1S)-2-[cyclopropyl(oxo)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-2-(dimethylamino)ethanone 1-[(1S)-2-acetyl-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-2-(4-morpholinyl)ethanone 1-[(1S)-2-acetyl-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 1-[(1S)-2-acetyl-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-1-butanone 1-[3-[[4-(4-fluorophenyl)-1-piperazinyl]methyl]-4-methoxyphenyl]-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid 1-acetyl-3-methoxycarbonyl-beta-carboline 1-Acetyl-beta-carboline 1-cyclohexyl-2-(1H-imidazol-2-ylmethyl)-1,3,4,9-tetrahydropyrido[3,4-b]indole 1-cyclohexyl-2-[(1-ethyl-2-imidazolyl)methyl]-1,3,4,9-tetrahydropyrido[3,4-b]indole 1-Ethyl-9H-pyrido[3,4-b]indole 1-ethyl-beta-carboline-3-carboxylic acid 1-Hydroxymethyl-beta-carboline 1-methyl-2,9-dihydropyrido[3,4-b]indol-7-one 1-methyl-4-methylthio-beta-carboline 1-Phenyl-2,3,4,9-tetrahydro-1H-beta-carboline-3-carboxylic acid 1-vinyl-beta-carboline-3-carboxylic acid 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(4-oxanylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(5-pyrimidinylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(pyridin-4-yl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(3-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(pyridin-4-ylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[oxo(3-pyridinyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-methyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-thiazolylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-methylsulfonyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(2-thiazolylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(4-oxanylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-(5-pyrimidinylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(pyridin-4-yl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(3-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(pyridin-4-ylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-[oxo(3-pyridinyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-methyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(2-thiazolylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(5-pyrimidinylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-methylsulfonyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-(dimethylamino)-1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(2-thiazolylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-[(1-ethyl-3-methyl-4-pyrazolyl)methyl]-1-(4-fluoro-3-methoxyphenyl)-1,3,4,9-tetrahydropyrido[3,4-b]indole 2-cyclopropyl-1-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-(3-pyridinylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(2-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(pyridin-4-ylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1R)-2-(2-cyclopropyl-1-oxoethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-cyclopropyl-1-[(1R)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1R)-2-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-(3-pyridinylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(2-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-(pyridin-4-ylmethyl)-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1S)-2-(2-cyclopropyl-1-oxoethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]ethanone 2-cyclopropyl-1-[(1S)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 2-cyclopropyl-1-[(1S)-2-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]ethanone 3-(7-hydroxy-9H-beta-carboline-1-yl)propanoic acid 3-Carboxy-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-1-propanoic acid 4,9-Dimethoxy-1-vinyl-beta-carboline 4-(9H-beta-carbolin-1-yl)-4-oxobut-2-enoic acid methyl ester 5-[[1-(2-methoxyphenyl)-1,3,4,9-tetrahydropyrido[3,4-b]indol-2-yl]methyl]-2-methylthiazole 6-(3-dimethylallyl)harmol 6-Hydroxyinfractin 6-hydroxymetatacarboline A 6-hydroxymetatacarboline C 6-hydroxymetatacarboline D 6-hydroxymetatacarboline E 6-hydroxymetatacarboline F 6-hydroxymetatacarboline G 6-hydroxymetatacarboline I 6-methoxy-1-methyl-3,4-dihydro-2H-pyrido[3,4-b]indole 7-methoxy-1-methyl-3,4-dihydro-2H-pyrido[3,4-b]indole 20-O-desmethylchaetogline F [(1R)-1'-(3-fluorophenyl)sulfonyl-7-methoxy-2,9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(benzenesulfonyl)-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(2-pyrazinyl)methanone [(1R)-1'-(benzenesulfonyl)-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(cyclohexylmethyl)-7-methoxy-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(cyclohexylmethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(cyclopentylmethyl)-7-methoxy-2-methylsulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(cyclopentylmethyl)-7-methoxy-9-methyl-2-(2-thiazolylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-pyridin-4-ylmethanone [(1R)-1'-(cyclopropylmethyl)-2-[(2-fluorophenyl)methyl]-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-(cyclopropylmethyl)-7-methoxy-2,9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-(cyclopropylmethyl)-7-methoxy-2-[(2-methoxyphenyl)methyl]-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-(cyclopropylmethyl)-7-methoxy-9-methyl-2-(phenylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-(cyclopropylmethyl)-7-methoxy-9-methyl-2-(phenylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-[(2,5-difluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-[(2,5-difluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-[(2-chlorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-[(2-chlorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-[(2-fluorophenyl)methyl]-7-methoxy-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-[(2-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-[(2-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1R)-1'-[(4-chlorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-[(4-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-fluorophenyl)methanone [(1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-fluorophenyl)methanone [(1R)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-fluorophenyl)methanone [(1R)-1'-ethylsulfonyl-2-[(2-fluorophenyl)methyl]-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-2,9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-2-(3-methoxyphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-2-(4-methylphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-1'-ethylsulfonyl-7-methoxy-9-methyl-2-(4-oxanylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-1-(hydroxymethyl)-7-methoxy-1'-(2-thiazolylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-(4-methoxyphenyl)sulfonyl-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-(phenylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-pyridin-4-ylmethanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(2-pyridinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(2-pyrazinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1R)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-pyridinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-2-[(4-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-phenylmethanone [(1R)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1R)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-pyridin-4-ylmethanone [(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(pyridin-4-yl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(3-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(4-methylphenyl)sulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(2-pyridinyl)methanone [(1R)-2-(1,3-benzodioxol-5-ylmethyl)-1'-ethylsulfonyl-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-(1,3-benzodioxol-5-ylmethyl)-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-(benzenesulfonyl)-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-(cyclopropylmethyl)-1'-(3-fluorophenyl)sulfonyl-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-2-(cyclopropylmethyl)-1'-[(4-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-fluorophenyl)methanone [(1R)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-fluorophenyl)methanone [(1R)-2-(cyclopropylmethyl)-7-methoxy-9-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-(cyclopropylmethyl)-7-methoxy-9-methyl-1'-thiophen-2-ylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-2-[(2,5-difluorophenyl)methyl]-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(2,5-difluorophenyl)methyl]-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-cyclopropylmethanone [(1R)-2-[(2-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1R)-2-[(3,5-dimethoxyphenyl)methyl]-1'-(3-fluorophenyl)sulfonyl-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(3,5-dimethoxyphenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-pyridinyl)methanone [(1R)-2-[(3,5-dimethoxyphenyl)methyl]-7-methoxy-9-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-2-[(3-chlorophenyl)methyl]-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(3-chlorophenyl)methyl]-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-2-[(3-fluorophenyl)-oxomethyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1R)-2-[(4-chlorophenyl)methyl]-1'-(cyclopropylmethyl)-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(4-chlorophenyl)methyl]-1'-(cyclopropylmethyl)-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-2-[(4-chlorophenyl)methyl]-7-methoxy-1'-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-2-[(4-chlorophenyl)methyl]-7-methoxy-1'-methylsulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(4-fluorophenyl)methyl]-7-methoxy-1'-(2-pyridinylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-2-[(4-fluorophenyl)methyl]-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1',9-dimethyl-2-(4-methylphenyl)sulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1',9-dimethyl-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1'-(3-pyridinylmethyl)-2-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1'-(4-methoxyphenyl)sulfonyl-2-(pyridin-4-ylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1'-(4-methylphenyl)sulfonyl-2-(phenylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-1'-(4-oxanylmethyl)-2-(pyridin-4-ylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-1'-(4-oxanylmethyl)-2-(pyridin-4-ylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1'-(phenylmethyl)-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-1'-(pyridin-4-ylmethyl)-2-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-1'-thiophen-2-ylsulfonyl-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2,9-dimethyl-1'-(3-methylphenyl)sulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2,9-dimethyl-1'-thiophen-2-ylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-(3-methoxyphenyl)sulfonyl-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-(phenylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-(pyridin-4-ylmethyl)-1'-[[4-(2-pyridinyl)phenyl]methyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-[(2-methoxyphenyl)methyl]-1',9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-[(2-methoxyphenyl)methyl]-1'-(4-methoxyphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1',9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-(2-pyridinylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-(2-pyridinylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-(4-oxanylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-2-[(3-methoxyphenyl)methyl]-9-methyl-1'-methylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-methyl-1'-(4-methylphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-2-methylsulfonyl-1'-(4-oxanylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1',2-bis(2-pyridinylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-(3-methylphenyl)sulfonyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-(4-methylphenyl)sulfonyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-(4-methylphenyl)sulfonyl-2-(phenylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-(4-oxanylmethyl)-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-(pyridin-4-ylmethyl)-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-[(5-phenyl-3-isoxazolyl)methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-[(5-phenyl-3-isoxazolyl)methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-[[4-(2-pyridinyl)phenyl]methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-1'-[[4-(2-pyridinyl)phenyl]methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-9-methyl-2-(4-methylphenyl)sulfonyl-1'-(3-pyridinylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-9-methyl-2-(4-oxanylmethyl)-1'-(2-thiazolylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1R)-7-methoxy-9-methyl-2-methylsulfonyl-1'-(2-thiazolylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1R)-7-methoxy-9-methyl-2-methylsulfonyl-1'-(4-oxanylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-(3-fluorophenyl)sulfonyl-7-methoxy-2,9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclohexylmethyl)-7-methoxy-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclohexylmethyl)-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclohexylmethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclopentylmethyl)-7-methoxy-2-methylsulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclopentylmethyl)-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclopentylmethyl)-7-methoxy-9-methyl-2-(2-thiazolylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-pyridin-4-ylmethanone [(1S)-1'-(cyclopropylmethyl)-2-[(2-fluorophenyl)methyl]-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-(cyclopropylmethyl)-2-[(2-fluorophenyl)methyl]-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclopropylmethyl)-7-methoxy-2,9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-(cyclopropylmethyl)-7-methoxy-2-[(2-methoxyphenyl)methyl]-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-(cyclopropylmethyl)-7-methoxy-9-methyl-2-(phenylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-[(2,5-difluorophenyl)methyl]-7-methoxy-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-[(2,5-difluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-[(2,5-difluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-[(2-chlorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-[(2-chlorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-[(2-fluorophenyl)methyl]-7-methoxy-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-[(2-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1S)-1'-[(4-chlorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-[(4-fluorophenyl)methyl]-7-methoxy-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-fluorophenyl)methanone [(1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-fluorophenyl)methanone [(1S)-1'-ethylsulfonyl-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-fluorophenyl)methanone [(1S)-1'-ethylsulfonyl-2-[(2-fluorophenyl)methyl]-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-ethylsulfonyl-7-methoxy-2,9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-ethylsulfonyl-7-methoxy-2-(3-methoxyphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-ethylsulfonyl-7-methoxy-2-(4-methylphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-ethylsulfonyl-7-methoxy-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-1'-ethylsulfonyl-7-methoxy-9-methyl-2-(4-oxanylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-1-(hydroxymethyl)-7-methoxy-1',9-dimethyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-oxanyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-(2-thiazolylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-(phenylmethyl)-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-pyridin-4-ylmethanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(2-pyridinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(2-pyrazinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1S)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-pyridinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-2-(2-pyridinylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-(2-pyridinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-2-[(4-methoxyphenyl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-phenylmethanone [(1S)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-2-methylsulfonyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-pyridin-4-ylmethanone [(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-[oxo(pyridin-4-yl)methyl]-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]-phenylmethanone [(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(3-pyridinylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(3-pyridinyl)methanone [(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(4-methylphenyl)sulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-(2-pyridinyl)methanone [(1S)-2-(1,3-benzodioxol-5-ylmethyl)-1'-ethylsulfonyl-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(1,3-benzodioxol-5-ylmethyl)-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(1,3-benzodioxol-5-ylmethyl)-7-methoxy-1'-propyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-(benzenesulfonyl)-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(cyclohexylmethyl)-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-(4-oxanyl)methanone [(1S)-2-(cyclopentylmethyl)-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(cyclopropylmethyl)-1'-[(2,5-difluorophenyl)methyl]-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(cyclopropylmethyl)-1'-[(4-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(cyclopropylmethyl)-1'-[(4-fluorophenyl)methyl]-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]-phenylmethanone [(1S)-2-(cyclopropylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(3-fluorophenyl)methanone [(1S)-2-(cyclopropylmethyl)-7-methoxy-9-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-(cyclopropylmethyl)-7-methoxy-9-methyl-1'-thiophen-2-ylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-[(2,5-difluorophenyl)methyl]-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(2,5-difluorophenyl)methyl]-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(2-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]-cyclopropylmethanone [(1S)-2-[(2-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-(4-oxanyl)methanone [(1S)-2-[(3,5-dimethoxyphenyl)methyl]-1'-(3-fluorophenyl)sulfonyl-7-methoxy-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(3,5-dimethoxyphenyl)methyl]-7-methoxy-9-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-[(3-chlorophenyl)methyl]-1'-ethylsulfonyl-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(3-chlorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]-cyclopropylmethanone [(1S)-2-[(3-chlorophenyl)methyl]-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(4-chlorophenyl)methyl]-1'-(cyclopropylmethyl)-7-methoxy-9-methyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-[(4-chlorophenyl)methyl]-7-methoxy-1'-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-[(4-chlorophenyl)methyl]-7-methoxy-1'-methylsulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(4-fluorophenyl)methyl]-7-methoxy-1',9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-2-[(4-fluorophenyl)methyl]-7-methoxy-1'-(2-pyridinylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-2-[(4-fluorophenyl)methyl]-7-methoxy-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-1',9-dimethyl-2-(4-methylphenyl)sulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-1',9-dimethyl-2-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-1'-(3-methylphenyl)sulfonyl-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-1'-(3-pyridinylmethyl)-2-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-1'-(4-methoxyphenyl)sulfonyl-2-(pyridin-4-ylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-1'-(4-methylphenyl)sulfonyl-2-(phenylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-1'-(4-oxanylmethyl)-2-(pyridin-4-ylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-1'-(pyridin-4-ylmethyl)-2-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-1'-[(3-methoxyphenyl)methyl]-2-methylsulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-1'-thiophen-2-ylsulfonyl-1-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2,9-dimethyl-1'-(3-methylphenyl)sulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2,9-dimethyl-1'-thiophen-2-ylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-(3-methoxyphenyl)sulfonyl-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-(2-thiazolylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-(4-methylphenyl)sulfonyl-1'-(phenylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-(phenylmethyl)-1'-(5-pyrimidinylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-(pyridin-4-ylmethyl)-1'-[[4-(2-pyridinyl)phenyl]methyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-[(2-methoxyphenyl)methyl]-1',9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-[(2-methoxyphenyl)methyl]-1'-(4-methoxyphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-[(2-methoxyphenyl)methyl]-9-methyl-1'-propyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1',9-dimethyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-(2-pyridinylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-(4-oxanylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-[(3-methoxyphenyl)methyl]-1'-methyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-[(3-methoxyphenyl)methyl]-9-methyl-1'-methylsulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-methyl-1'-(4-methylphenyl)sulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-methyl-1'-[(1-methyl-4-imidazolyl)sulfonyl]-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-2-methyl-1'-methylsulfonyl-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-2-methylsulfonyl-1'-(4-oxanylmethyl)-1-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-1',2-bis-(4-methylphenyl)sulfonyl-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(3-methylphenyl)sulfonyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(3-methylphenyl)sulfonyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(4-methylphenyl)sulfonyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(4-methylphenyl)sulfonyl-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(4-methylphenyl)sulfonyl-2-(phenylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(4-oxanylmethyl)-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-(pyridin-4-ylmethyl)-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-[(5-phenyl-3-isoxazolyl)methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-[[4-(2-pyridinyl)phenyl]methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-1'-[[4-(2-pyridinyl)phenyl]methyl]-1-spiro[2,3-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-2-(4-methylphenyl)sulfonyl-1'-(3-pyridinylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-2-(4-oxanylmethyl)-1'-(2-thiazolylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanol [(1S)-7-methoxy-9-methyl-2-methylsulfonyl-1'-(2-thiazolylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [(1S)-7-methoxy-9-methyl-2-methylsulfonyl-1'-(5-pyrimidinylmethyl)-1-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanol [3-(1-methyl-2-pyrrolyl)-1H-pyrazol-5-yl]-[1-(2-pyridinyl)-1,3,4,9-tetrahydropyrido[3,4-b]indol-2-yl]methanone beta-carboline-1-propionic acid beta-Carboline-2-carbaldehyde, 1-(quinolin-8-yl)-1,3,4,9-tetrahydro- Borrerine Brevicarine Brevicolline Brunnein A Brunnein B Calligonine Ceceline cyclobutyl-[(1R)-1'-(cyclopentylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclobutyl-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyridinyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-spiro[1,2,3,9-tetrahydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclobutyl-[(1R)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1R)-1-(hydroxymethyl)-7-methoxy-2-[oxo(pyridin-4-yl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclobutyl-[(1R)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1R)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclobutyl-[(1S)-1'-(cyclopentylmethyl)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclobutyl-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-[oxo(2-pyridinyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-methylsulfonyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1S)-1-(hydroxymethyl)-7-methoxy-2,9-dimethyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1S)-1-(hydroxymethyl)-7-methoxy-2-[oxo(pyridin-4-yl)methyl]-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclobutyl-[(1S)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclobutyl-[(1S)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclohexyl-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-methyl-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclohexyl-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(2-thiazolylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclohexyl-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(pyridin-4-ylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclohexyl-[(1S)-1-(hydroxymethyl)-7-methoxy-2-(2-thiazolylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclohexyl-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-(pyridin-4-ylmethyl)-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopentyl-[(1R)-1-(hydroxymethyl)-7-methoxy-2-(2-thiazolylmethyl)-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclopentyl-[(1R)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclopentyl-[(1S)-1-(hydroxymethyl)-7-methoxy-9-methyl-2-methylsulfonyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclopropyl-[(1R)-1'-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclopropyl-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-[(2-methoxyphenyl)methyl]-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1R)-1-(hydroxymethyl)-7-methoxy-1'-[(3-methoxyphenyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1R)-1-(hydroxymethyl)-7-methoxy-2-methyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1R)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1S)-1'-[(3-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,4'-piperidine]yl]methanone cyclopropyl-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-[(2-methoxyphenyl)methyl]-9-methyl-2-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1S)-1-(hydroxymethyl)-7-methoxy-1'-[(3-methoxyphenyl)methyl]-2-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1S)-1-(hydroxymethyl)-7-methoxy-2-methyl-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1S)-2-[(2,5-difluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-9-methyl-1'-spiro[1,3-dihydropyrido[3,4-b]indole-4,3'-azetidine]yl]methanone cyclopropyl-[(1S)-2-[(2-fluorophenyl)methyl]-1-(hydroxymethyl)-7-methoxy-1'-spiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,4'-piperidine]yl]methanone daibucarboline A daibucarboline B daibucarboline C Dehydroxymethylflazine Deoxytubulosine Dialdehyde 11678 Dichotomide IX Dichotomide VII Dichotomide VIII Dichotomide X Dichotomide XI Dichotomide XII, (rel)- Dichotomide XIII, (rel)- Dichotomide XIV Eudistomin G Eudistomin H flazin Flazine methyl ether Glucodichotomine B Harmalan harmaline harmalol harman harmine Harmine HCl harmol Infractin Isoeudistomine U Lavendamycin Marinacarboline A Marinacarboline C Marinacarboline D Marinacarboline M Marinacarboline N Metatacarboline A Metatacarboline C Metatacarboline D Metatacarboline E Metatacarboline F Metatacarboline G methyl 1-((2-methyl carbamate)ethyl)-beta-carboline-3-carboxylate methyl 1-(methyl propionate)-beta-carboline-3-carboxylate methyl 1-(propionic acid)-beta-carboline-3-carboxylate N-(2,3-dimethylphenyl)-1-methyl-9H-pyrido[3,4-b]indole-3-carboxamide N-Methoxy-1-vinyl-beta-carboline Nonocarboline A Nonocarboline B Nonocarboline C Nonocarboline D Nonocarboline E Ochrolifuanine A Oxopropaline A Oxopropaline D Oxopropaline G Penipaline B Pityriacitrin Pityriacitrin B Pityriarubin A Pyridindolol Pyridindolol K1 Pyridindolol K2 Sphecoline B Sphecoline C Sphecoline D Stellarine A Stellarine B TCMDC-138263 Tetrahydroharmine Tetrahydroharmol Usambarensine Usambarine Show first 5 Terms