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Risperidone EP Imp H Risperidone IMpurity H Risperidone Impurity 1 Risperidone EP IMpurity H 3-[2-[4-(2,4-Difluorobenzoyl)piperi 2,4-Difluorobenzoyl Risperidone IMpurity Risperidone Impurity 8(Risperidone EP Impurity H) Risperidone EP Impurity H (Risperidone Difluoroketone) 3-[2-[4-(2,4-Difluorobenzoyl)piperidino]ethyl]-6,7,8,9- tetrahydro-2-Methyl-4H-pyrido[1,2-a]pyriMidin-4-one 3-[2-[4-(2,4-Difluorobenzoyl)piperidin-1-yl]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-[2-[4-(2,4-difluorobenzoyl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-2-methyl- Risperidone impurity 6/Risperidone EP Impurity H/Risperidone difluoroketone/3-[2-[4-(2,4-Difluorobenzoyl)piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one