Ethyl 3-(2-ethoxy-2-oxoethyl)-2,5-dimethyl-4-oxo-3,4-dihydrothieno[3,4-d]pyrimidine-7-carboxylate;Thieno[3,4-d]pyrimidine-3(4H)-acetic acid, 7-(ethoxycarbonyl)-2,5-dimethyl-4-oxo-, ethyl ester
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