134749-27-2 2-(2-Hydrazino-6,7-dimethoxy-4-quinazolinyl)hydrazinecarboxamide monohydrochloride 6,7-Dimethoxy-4-semicarbazido-2-hydrazinoquinazoline hydrochloride Hydrazinecarboxamide, 2-(2-hydrazino-6,7-dimethoxy-4-quinazolinyl)-, monohydrochloride