116990-02-4 6H-Indolo(2,3-b)quinoxaline-6-acetic acid, 9-chloro-, 2-(1-(4-methylphenyl)ethylidene)hydrazide 9-Chloro-6H-indolo(2,3-b)quinoxaline-6-acetic acid 2-(1-(4-methylphenyl)ethylidene)hydrazide