英文别名2-Methyl-3-vinyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one; 3-ethenyl-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one; 3-Vinyl-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one; 3-Ethenyl-6,7,8,9-tetrahydro-2-Methyl-4H-pyrido[1,2-a]pyrimidin-4-one; Risperidone Impurity R4; Risperidone Impurity 29 
