16867-53-1 4H-Pyrido(1,2-a)pyrimidine-3-carboxylic acid, 6-methyl-4-oxo-, ethyl ester 6-Methyl-4-oxo-4H-pyrido(1,2-a)pyrimidine-3-carboxylic acid ethyl ester BRN 0749725 MZ-104