SDF42: Sildenafil Monosulfone Dimer Impurity

5-[2-Ethoxy-5-[4-[4-ethoxy-3-(1-methyl-7-oxo-3-propyl-4,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)phenyl]sulfonyl]phenyl]-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one ; 

CAS # 1346603-48-2 ;

C34H38N8O6S ;

MW: 686.78 ;