Synonyms: (9R)-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, (R)-9-Hydroxyrisperidone, 1,2-Benzisoxazole, 4H-pyrido[1,2-a]pyrimidin-4-one deriv., (+)-9-Hydroxyrisperidone, (9R)-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