134749-28-3 2-(2-(Diethylamino)-6,7-dimethoxy-4-quinazolinyl)hydrazinecarboxamide hemihydrate 6,7-Dimethoxy-4-semicarbazido-2,4-diethylaminoquinazoline semihydrate Hydrazinecarboxamide, 2-(2-(diethylamino)-6,7-dimethoxy-4-quinazolinyl)-, hemihydrate