A citrate salt of Sildenafil sold under the brand name of Viagra. Sildenafil is used for the treatment of erectile dysfunction and pulmonary arterial hypertension. 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 Citrate API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.
Sildenafil Citrate
Catalogue No.:PA 19 09000
CAS :
Molecular Formula : C28H38N6O11S
Molecular Weight : 666.71
Isobutyl Sildenafil
Catalogue No.:PA 19 09010
Molecular Formula : C23H32N6O4S
Molecular Weight : 488.60
5-[2-Ethoxy-5-(4-methyl-4-oxy-piperazine-1-sulfonyl)-phenyl]-1-methyl-3-propyl-1,6-dihydro-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 09020
Molecular Formula : C22H30N6O5S
Molecular Weight : 490.58
5-[2-Hydroxy-5-(4-methylpiperazinylsulphonyl)phenyl]1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyramidin-7-one
Catalogue No.:PA 19 09030
Molecular Formula : C20H26N6O4S
Molecular Weight : 446.52
4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5- yl)benzenesulfonic Acid
Catalogue No.:PA 19 09040
Molecular Formula : C17H20N4O5S
Molecular Weight : 392.43
1H-Imidazole
Catalogue No.:PA 19 09050
Molecular Formula : C3H4N2
Molecular Weight : 68.08
Sildenafil Dimer Impurity
Catalogue No.:PA 19 09070
Molecular Formula : C38H46N10O8S2
Molecular Weight : 834.96
Sildenafil Amino Amide Impurity
Catalogue No.:PA 19 09520
Molecular Formula : C8H14N4O
Molecular Weight : 182.22
Sildenafil Chloro Impurity
Catalogue No.:PA 19 09540
Molecular Formula : C9H9ClO2
Molecular Weight : 184.62
Sildenafil Carboxamide Impurity
Catalogue No.:PA 19 09550
Molecular Formula : C17H22N4O3
Molecular Weight : 330.38
Sildenafil Lactam Impurity
Catalogue No.:PA 19 09560
Molecular Formula : C17H20N4O2
Molecular Weight : 312.37
Sildenafil Chlorosulfonyl Impurity
Catalogue No.:PA 19 09570
Molecular Formula : C17H19ClN4O4S
Molecular Weight : 410.88
5-[2-Ethoxy-5-(piperazin-1-ylsulfonyl)phenyl]-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 09580
Molecular Formula : C21H28N6O4S
Molecular Weight : 460.55
Propoxyphenyl Sildenafil
Catalogue No.:PA 19 09620
Molecular Weight : 488.6
4-Amino-1-methyl-5-propyl-1H-pyrazole-3-carboxamide
Catalogue No.:PA 19 09650
Sildenafil Amide Impurity
Catalogue No.:PA 19 09660
Molecular Formula : C8H12N4O3
Molecular Weight : 212.21
1-Methyl-4-nitro-3-propyl-1H-pyrazole-5-carboxylic acid
Catalogue No.:PA 19 09680
Molecular Formula : C8H11N3O4
Molecular Weight : 213.19
Demethylpiperazinyl Iso Sildenafil Sulfonyl Chloride
Catalogue No.:PA 19 09690
(E)-4-((2-Ethoxybenzylidene)amino)-1-methyl-3-propyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09720
Molecular Formula : C17H22N4O2
Molecular Weight : 314.38
Iso Sildenafil
Catalogue No.:PA 19 09730
Molecular Formula : C22H30N6O4S
Molecular Weight : 474.58
1-Methyl-4-nitroso-3-propyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09740
Molecular Formula : C8H12N4O2
Molecular Weight : 196.21
4-(Hydroxyamino)-1-methyl-3-propyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09750
Molecular Formula : C8H14N4O2
Molecular Weight : 198.23
4-[2-Ethoxy-5-(1-piperazinylsulfonyl)benzoamido]-1-methyl-3-propyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09760
Molecular Formula : C21H30N6O5S
Molecular Weight : 478.57
Sildenafil Aldehyde
Catalogue No.:PA 19 09510
Molecular Formula : C14H20N2O4S
Molecular Weight : 312.38
Sildenafil Amide Impurity Hydrochloride
Catalogue No.:PA 19 09530
Molecular Formula : C8H15ClN4O
Molecular Weight : 218.68
4-Ethoxy-N,N-bis(2-hydroxyethyl)-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonamide
Catalogue No.:PA 19 09590
Molecular Formula : C21H29N5O6S
Molecular Weight : 479.55
O-Desethyl-O-propyl Methisosildenafil
Catalogue No.:PA 19 09600
Molecular Formula : C24H34N6O4S
Molecular Weight : 502.63
Propoxyphenyl Homohydroxysildenafil
Catalogue No.:PA 19 09610
Molecular Formula : C24H34N6O5S
Molecular Weight : 518.63
Descarbonsildenafil
Catalogue No.:PA 19 09630
Molecular Formula : C21H30N6O4S
Molecular Weight : 462.57
5-(5-Carboxy-2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 09640
Molecular Formula : C18H20N4O4
Molecular Weight : 356.38
Sildenafil Methyl Sulfonate Ester Impurity
Catalogue No.:PA 19 09670
Molecular Formula : C18H22N4O5S
Molecular Weight : 406.46
(Z)-N'-(5-Chloro-4-methyl-2-propyl-1H-imidazol-1-yl)-2-ethoxy-5-((4-ethylpiperazin-1-yl)sulfonyl)benzimidamide
Catalogue No.:PA 19 09700
Molecular Formula : C22H33ClN6O3S
Molecular Weight : 497.05
(Z)-N'-(5-Chloro-4-methyl-2-propyl-1H-imidazol-1-yl)-2-ethoxybenzimidamide
Catalogue No.:PA 19 09710
Molecular Formula : C16H21ClN4O
Molecular Weight : 320.82
4-(2-Ethoxybenzamido)-3-isobutyl-1-methyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09770
Molecular Formula : C18H24N4O3
Molecular Weight : 344.42
Homo Sildenafil
Catalogue No.:PA 19 09780
Molecular Weight : 488.61
S-des[2-(1-Methyl-2-pyrrolidinyl)ethyl]amine S-Hydroxy Udenafil
Catalogue No.:PA 19 09790
Propoxyphenyl-thiohydroxyhomosildenafil
Catalogue No.:PA 19 09800
Molecular Formula : C24H34N6O4S2
Molecular Weight : 534.69
Thiodimethylsildenafil
Catalogue No.:PA 19 09810
Molecular Formula : C23H32N6O3S2
Molecular Weight : 504.67
Catalogue No.:PA IPIPRS 77 14
Molecular Formula :
Molecular Weight : NA
Sildenafil for peak identification (Y0001891)
Catalogue No.:PA EPY0001891
Molecular Formula : NA
Sildenafil Citrate (1612561)
Catalogue No.:PA USP1612561
Sildenafil Related Compound A (5-[2-Ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-( (1612685)
Catalogue No.:PA USP1612685
3-[[[5-Aminocarbonyl-1-methyl-3-propyl-1H-pyrazol-4-yl]amino]carbonyl]-4-ethoxy-benzenesulfonyl Dimer
Catalogue No.:PA 19 09960
Molecular Formula : C34H42N8O8S
Molecular Weight : 722.81
3-[[[5-(Aminocarbonyl)-1-methyl-3-propyl-1H-pyrazol-4-yl]amino]carbonyl]-4-propoxy-benzenesulfonyl Chloride
Catalogue No.:PA 19 09970
Molecular Formula : C18H23ClN4O5S
Molecular Weight : 442.92
4-Amino-1-methyl-3-(2-methylpropyl)-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09980
Molecular Formula : C9H16N4O
Molecular Weight : 196.25
Chlorodenafil
Catalogue No.:PA 19 09820
Molecular Formula : C19H21ClN4O3
Molecular Weight : 388.85
Demethylpiperazinyl Desethyl Sildenafil Sulfonyl Chloride
Catalogue No.:PA 19 09830
Molecular Formula : C15H15ClN4O4S
Molecular Weight : 382.82
Ethyl 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonate
Catalogue No.:PA 19 09880
Molecular Formula : C19H24N4O5S
Molecular Weight : 420.48
2-Ethoxy-5-(ethoxysulfonyl)benzoic Acid
Catalogue No.:PA 19 09890
Molecular Formula : C11H14O6S
Molecular Weight : 274.29
Ethyl 2-ethoxy-5-(ethoxysulfonyl)benzoate
Catalogue No.:PA 19 09900
Molecular Formula : C13H18O6S
Molecular Weight : 302.34
Methyl 2-ethoxy-5-(methoxysulfonyl)benzoate
Catalogue No.:PA 19 09910
2-Ethoxy-5-((4-ethylpiperazin-1-yl)sulfonyl)benzoic Acid
Catalogue No.:PA 19 09920
Molecular Formula : C15H22N2O5S
Molecular Weight : 342.41
5-(2-methoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 09930
4-(2-Methoxy-5-((4-methylpiperazin-1-yl)sulfonyl)benzamido)-1-methyl-3-propyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09940
4-(2-Methoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1H-pyrazole-5-carboxamide
Catalogue No.:PA 19 09950
Molecular Formula : C20H29N5O4S
Molecular Weight : 435.54
2-Methoxy-5-((4-methylpiperazin-1-yl)sulfonyl)benzoic Acid
Catalogue No.:PA 19 09515
Molecular Formula : C13H18N2O5S
Molecular Weight : 314.36
2-Hydroxy-5-[(4-methyl-1-piperazinyl)sulfonyl]benzoic Acid
Catalogue No.:PA 19 09525
Molecular Formula : C12H16N2O5S
Molecular Weight : 300.33
5,5'-(Piperazine-1,4-disulfonyl)bis(2-ethoxybenzoic Acid)
Catalogue No.:PA 19 09990
Molecular Formula : C22H26N2O10S2
Molecular Weight : 542.57
Nor Acetildenafil
Catalogue No.:PA 19 09535
Molecular Formula : C24H32N6O3
Molecular Weight : 452.55
2-Ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]- benzoic Acid
Catalogue No.:PA 19 0091000
Molecular Formula : C14H20N2O5S
Molecular Weight : 328.38
3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxy-N-[2-(methylamino)ethyl]benzenesulfonamide Hydrochloride
Catalogue No.:PA 19 0091001
Molecular Formula : C20H29ClN6O4S
Molecular Weight : 485
5-(2-Isobutyl)-4-amino-1H-pyrazole-3-carboxylic acid
Catalogue No.:PA 19 0091003
Molecular Formula : C8H13N3O2
Molecular Weight : 183.21
5-(5-Chlorosulfonyl-2-ethoxyphenyl)-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No.:PA 19 0091004
Molecular Formula : C16H17ClN4O4S
Molecular Weight : 396.85
Desmethyl Thiosildenafil
Catalogue No.:PA 19 0091005
Molecular Formula : C21H28N6O3S2
Molecular Weight : 476.61
5-(2-(Benzyloxy)phenyl)-1,4-dihydro-7H-[1,2,3]triazolo[4,5-d]pyrimidin-7-one
Catalogue No.:PA 19 0091006
Molecular Formula : C17H13N5O2
Molecular Weight : 319.32
3-Isobutylpyrazolo[4,3-d]pyrimidine
Catalogue No.:PA 19 0091007
Molecular Formula : C9H12N4
Molecular Weight : 176.22
De(methypiperazinyl) Sildenafil Dimer
Catalogue No.:PA 19 0091008
Molecular Formula : C34H38N8O6S
Molecular Weight : 686.79
Sildenafil Citrate (IPRSS015)
Catalogue No.:PA IPRSS015
Sildenafil Citrate (WSM)
Catalogue No.:PA WSM 00919016
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