134749-21-6 2-Chloro-6,7-dimethoxy-4-isopropylidenehydrazinoquinazoline hydrochloride 4(1H)-Quinazolinone, 2-chloro-6,7-dimethoxy-, (1-methylethylidene)hydrazone, monohydrochloride 4(3H)-Quinazolinone, 2-chloro-6,7-dimethoxy-, (1-methylethylidene)hydrazone, HCl