英文别名Risperidone Ethyl Impurity; 3-ethyl-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one; 2-Methyl-3-ethyl-6,7,8,9-tetrahydro-4H-pyrido<1,2-a>pyrimidin-4-on; 3-Ethyl-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one; Risperidone Impurity; Risperidone Impurity 23 
