3-(Ethoxycarbonyl)-6,7,8,9-tetrahydro-6-methyl-4-oxo-4H-pyrido(1,2-a)pyrimidine-9-acetic acid 3-Carbethoxy-6-methyl-9-carboxymethyl-4-oxo-6,7,8,9-tetrahydro-4H-pyrido(1,2-A)pyrimidine 64405-40-9 CH 123 Chinoin 123