134749-35-2 2-(2-(Ethylamino)-6,7-dimethoxy-4-quinazolinyl)hydrazinecarboxamide 6,7-Dimethoxy-4-semicarbazido-2-ethylaminoquinazoline BRN 4819895 Hydrazinecarboxamide, 2-(2-(ethylamino)-6,7-dimethoxy-4-quinazolinyl)-