sildenafil and its Impurities
Sildenafil is used for the treatment of erectile dysfunction and pulmonary arterial hypertension. It is sold under the brand name of Viagra. Sildenafil inhibits an enzyme cGMP-specific phosphodiesterase type 5 that promotes degradation of cGMP, which regulates blood flow in the penis.Reference standards of Sildenafil API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.
4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonyl Chloride
4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonyl Chloride
Catalogue No.:PAI 19 012010
CAS :
NA
Molecular Formula : C17H19ClN4O4S
Molecular Weight : 410.87
4-[[2-Ethoxy-5-[(4-methyl-1-piperazinyl)- sulfonyl]benzoyl]amino]-1-methyl-3-propyl- 1H-pyrazole-5-carboxamide
4-[[2-Ethoxy-5-[(4-methyl-1-piperazinyl)- sulfonyl]benzoyl]amino]-1-methyl-3-propyl- 1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 0081000
CAS :
200575-15-1
Molecular Formula : C22H32N6O5S
Molecular Weight : 492.6
5-(2-Ethoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-6-nitroso-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
5-(2-Ethoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-6-nitroso-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 0081005
CAS :
NA
Molecular Formula : C22H29N7O5S
Molecular Weight : 503.58
5-(2-Ethoxy-5-((4-nitrosopiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
5-(2-Ethoxy-5-((4-nitrosopiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 0081006
CAS :
NA
Molecular Formula : C21H27N7O5S
Molecular Weight : 489.55