Risperidone EP Impurity C

: Risperidone BP Impurity C; 9-Hydroxy Risperidone; Paliperidone; (9RS)-3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidin1-yl]ethyl]-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4Hpyrido[1,2-a]pyrimidin-4-one; 3-[2-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one