methyl 4-[4-(4-amino-6,7-dimethoxyquinazolin-2-yl)piperazine-1-carbonyl]-2-oxido-1,2,5-oxadiazol-2-ium-3-carboxylate
methyl 4-[4-(4-amino-6,7-dimethoxy-quinazolin-2-yl)piperazine-1-carbonyl]-2-oxido-1,2,5-oxadiazol-2-ium-3-carboxylate
4-[[4-(4-amino-6,7-dimethoxy-2-quinazolinyl)-1-piperazinyl]-oxomethyl]-2-oxido-1,2,5-oxadiazol-2-ium-3-carboxylic acid methyl ester
4-[4-(4-amino-6,7-dimethoxy-quinazolin-2-yl)piperazine-1-carbonyl]-2-oxido-furazan-2-ium-3-carboxylic acid methyl ester
methyl 4-[4-(4-amino-6,7-dimethoxy-quinazolin-2-yl)piperazin-1-yl]carbonyl-2-oxido-1,2,5-oxadiazol-2-ium-3-carboxylate