1,4-Dihydro-2-(2,3-dimethoxyphenyl)-4-oxo-6-quinazolinecarboxylic acid 6-Carboxy-2-(2',3'-dimethoxyphenyl)-3,4-dihydro-4-oxoquinazoline 6-Quinazolinecarboxylic acid, 1,4-dihydro-2-(2,3-dimethoxyphenyl)-4-oxo- 68274-49-7