Synonyms: Probon acid;MZ-211;6,7,8,9-Tetrahydro-3-carboxy-1,6-dimethyl-4-oxo-4H-pyrido(1,2-a)pyrimidinium methyl sulfate;3-carboxy-1,6-dimethyl-4-oxo-6,7,8,9-tetrahydro-4h-pyrido[1,2-a]pyrimidin-1-ium methyl sulfate;4H-Pyrido(1,2-a)pyrimidinium, 6,7,8,9-tetrahydro-3-carboxy-1,6-dimethyl-4-oxo-, methyl sulfate;AC1Q22SL;AC1L4X47;AR-1F2421;LS-134153;1,6-dimethyl-4-oxo-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-1-ium-3-carboxylic acid; methyl sulfate