SDF04: Sildenafil EP Impurity D

Sildenafil Impurity D ;

Desmethylpiperazinyl Sildenafil Sulfonic Acid ;

3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxybenzenesulfonic acid ;

CAS # 1357931-55-5 ;

C17H20N4O5S ;

MW: 392.43 ;