5-CARBETHOXY-2-THIOURACIL, ETHYL 2-THIOURACIL-5-CARBOXYLATE, 2-thioisoorotic acid ethyl ester, 4-hydroxy-2-mercapto-5-pyrimidinecarboxylicaciethylester, 2-Thioisoorotic acid ethyl ester, 5-Carbethoxy-4-hydroxy-2-mercaptopyrimidine, Ethyl 2-thiouracil-5-carboxylate