52013-82-8 8-Ethyl-5,6,7,8-tetrahydro-2-(methylthio)-5-oxo-pyrido(2,3-d)pyrimidine-6-carboxylic acid ethyl ester EINECS 257-604-4 Ethyl 8-ethyl-5,6,7,8-tetrahydro-2-(methylthio)-5-oxopyrido(2,3-d)pyrimidine-6-carboxylate