Fig. 1

The high resolution mass spectra and secondary mass spectra for 9 known compounds

Fig. 2

The high resolution mass spectra and secondary mass spectra for 5 unknown compounds

Fig. 3

Structures of compounds 1–9

Fig. 4

Mass spectral fragmentation behavior of protopine alkaloids

Fig. 5

Mass spectral fragmentation behavior of benzophenanthrine alkaloids

Fig. 6

Mass spectral fragmentation behavior of dimer alkaloids

Fig. 7

Mass spectral fragmentation behavior of dihydrobenzophenanthrine alkaloids

Fig. 8

In vivo antiangiogenic effects of protopine and chelerythrine in transgenic zebrafish

Acknowledgments

This image is the copyrighted work of the attributed author or publisher, and ZFIN has permission only to display this image to its users. Additional permissions should be obtained from the applicable author or publisher of the image. Full text @ BMC Chem