33484-46-7 4H-Pyrido(1,2-a)pyrimidinium, 6,7,8,9-tetrahydro-1,6-dimethyl-4-oxo-, methyl sulfate 6,7,8,9-Tetrahydro-1,6-dimethyl-4-oxo-4H-pyrido(1,2-a)pyrimidinium methyl sulfate MZ-218