33484-43-4 4H-Pyrido(1,2-a)pyrimidine-3-carboxylic acid, 6-methyl-4-oxo-, methyl ester 6-Methyl-4-oxo-4H-pyrido(1,2-a)pyrimidine-3-carboxylic acid methyl ester BRN 4445646 MZ-128