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Fig. 1 Schematic diagram of the synthesis route and sensing mechanism of NAHCP: (a) glycine ethyl ester hydrochloride, triethylamine, EtOH, 40 °C, 4 h; (b) N-hydroxyphthalimide, K2CO3, and DMF, 110 °C, 2 h; (c) hexamethylenetetramine and F3CCOOH, 80 °C, 4 h; (d) 2,4-dinitrofluorobenzene and triethylamine, RT, 3 h.
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