4-(6-Ethyl-2-methylsulfanyl-4-oxo-4H-thieno[2,3-d]pyrimidin-3-ylmethyl)-benzoic acid methyl ester
4-(6-Ethyl-4-oxo-2-thioxo-1,4-dihydro-2H-thieno[2,3-d]pyrimidin-3-ylmethyl)-benzoic acid
4-(6-Ethyl-4-oxo-2-thioxo-1,4-dihydro-2H-thieno[2,3-d]pyrimidin-3-yl)-benzoic acid
2-[3-(4-Ethoxycarbonyl-phenyl)-thioureido]-5-ethyl-thiophene-3-carboxylic acid ethyl ester
2-[3-(4-Ethoxycarbonyl-benzyl)-thioureido]-5-ethyl-thiophene-3-carboxylic acid ethyl ester