Risperidone EP Impurity I

: Risperidone BP Impurity I; 3-[2-[4-[4-fluoro-2-[4-(6-fluoro-1,2-benzisoxazol-3yl)piperidin-1-yl]benzoyl]piperidin-1-yl]ethyl]-2-methyl6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one; 3-[2-[4-{4-Fluoro-2-[4-(6-fluorobenzo[d]soxazol-3-yl)piperidin-1-yl]benzolyl]piperidin-1-yl]ethyl-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one