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Risperidone Impurity Risperidone Impurity 23 Paliperidone Impurity 27 Risperidone Ethyl Impurity 3-ethyl-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one 3-Ethyl-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-α]pyrimidin-4-one 3-Ethyl-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one 3-Ethyl-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one 4H-Pyrido[1,2-a]pyrimidin-4-one, 3-ethyl-6,7,8,9-tetrahydro-2-methyl- 3-Ethyl-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one(Risperidone Impurity) 3-Ethyl-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-α]pyrimidin-4-one (Risperidone Impurity)