Synonyms: [1]benzothieno[2,3-d]pyrimidine-2-carboxylic acid, 3,4,5,6,7,8-hexahydro-4-oxo-, ethyl ester;Ethyl 4-oxo-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidine-2-carboxylate;ethyl 4-oxo-3,4,5,6,7,8-hexahydrobenzo[4,5]thieno[2,3-d]pyrimidine-2-carboxylate