2-Methyl-3-ethyl-7-chloro-4-oxo-4H-pyrido(1,2-a)pyrimidine hydrochloride 4H-Pyrido(1,2-a)pyrimidin-4-one, 7-chloro-3-ethyl-2-methyl-, monohydrochloride 7-Chloro-3-ethyl-2-methyl-4H-pyrido(1,2-a)pyrimidin-4-one monohydrochloride 70429-40-2