3-Ethyl-2-methyl-6,7,8,9-tetrahydro-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(risperidone impurity) ; 3-ethyl-6,7,8,9-tetrahydro-2-methyl-4h-pyrido[1,2-α]pyrimidin-4-one ; risperidone impurity ; 3-ethyl-2-methyl-6,7,8,9-tetrahydro-4h-pyrido[1,2-α]pyrimidin-4-one (risperidone impurity) ; 3-ethyl-6,7,8,9-tetrahydro-2-methyl-4h-pyrido[1,2-a]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 ; risperidone ethyl impurity