Paliperidone USP Related Compound A,3-Ethyl-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido [1,2-a]pyrimidin-4-one hydrochloride,"3-Ethyl-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one is used in the synthesis of Paliperidone . Intermediate. ",Paliperidone Therapeutic