SDF47: Sildenafil Lactam Impurity

5-(2-Ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazole[4,3-d]pyrimidine-7-one ;

CAS # 139756-21-1 ;

C17H20N4O2 ;

MW: 312.37 ;