Sildenafil

Sildenafil EP Impurity A Sildenafil Impurity A:

5-[2-Ethoxy-5-[(4-methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-(2-methylpropyl)-7H-pyrazolo[4,3-d]pyrimidin-7-one ; C23H32N6O4S ; MW: 488.6 ;
Sildenafil EP Impurity B Sildenafil Impurity B:

5-[2-Ethoxy-5-[(4-methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one ; CAS : 1094598-75-0 ; C22H30N6O5S ; MW: 490.58 ;
Sildenafil EP Impurity C Sildenafil Impurity C:

5-[2-Hydroxy-5-(4-methylpiperazinylsulphonyl)phenyl]1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyramidin-7-one ; CAS : 139755-91-2 ; C20H26N6O4S ;MW: 446.52 ;
Sildenafil EP Impurity D Sildenafil Impurity D:

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 ;