英文别名9-oxo-risperidone; 9-Keto Risperidone; Paliperidone Impurity 1; 3-[2-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-7,8-dihydro-2-Methyl-4H-pyrido[1,2-a]pyriMidine-4,9(6H)-dione; 3-[2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl]-2-methyl-7,8-dihydro-6H-pyrido[1,2-a]pyrimidine-4,9-dione; Paliperidone 9-Keto Impurity; 3-{2-[4-(6-Fluoro-1,2-benzoxazol-3-yl)-1-piperidinyl]ethyl}-2-methyl-7,8-dihydro-4H-pyrido[1,2-a]pyrimidine-4,9(6H)-dione