Synonyms: 3-[2-[4-(1,2-Benzisoxazol-3-yl)piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one, 1,2-Benzisoxazole, 4H-pyrido[1,2-a]pyrimidin-4-one deriv., Desfluororisperidone, Risperidone Imp. K (EP), Desfluoro risperidone (USP)