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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Sildenafil, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Sildenafil impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Sildenafil-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Sildenafil Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Descarbonsildenafil-d3 Stable Isotopes CS-T-103889 1393816-99-3(unlabelled) Enquire
Descarbonsildenafil-d6 Stable Isotopes CS-T-99310 Not Available Enquire
Desmethyl Thiosildenafil D8 Stable Isotopes CS-EO-02367 1215321-44-0 Enquire
Iso Sildenafil-d3 Stable Isotopes CS-T-99191 1794829-17-6 Enquire
N-desmethyl Sildenafil-d8 Stable Isotopes CS-O-06962 1185168-06-2 In Stock
N-Desmethyl-N-benzyl Sildenafil-d5 Stable Isotopes CS-T-99299 ---- Enquire
N-Nitroso N-Desmethyl Sildenafil-d8 Stable Isotopes CS-O-53094 Not Available In Stock
O-Desethyl-O-propyl Methisosildenafil-d4 Stable Isotopes CS-T-96819 Not Available Enquire
Propoxyphenyl ​thiohydroxyhomosilde​nafil-d4 Stable Isotopes CS-T-94456 479073-90-0 unlabelled Enquire
Propoxyphenyl-thiosildenafil-d8 Stable Isotopes CS-T-96780 Not Available Enquire
Sildenafil Citrate 13CD3 Stable Isotopes CS-EO-02582 171599-83-0(Unlabeled) Enquire
Sildenafil D5 Stable Isotopes CS-EO-02581 139755-83-2(Unlabeled) Enquire
Sildenafil dimer-d8 Stable Isotopes CS-O-41251 1346602-67-2(unlabeled) In Stock
Sildenafil-d3 Stable Isotopes CS-O-06964 1126745-90-1 In Stock
Sildenafil-d3 citrate Stable Isotopes CS-C-02139 1126745-90-1 (Freebase) Enquire
Sildenafil-d8 Stable Isotopes CS-O-06963 951385-68-5 In Stock
Sildenafil-d8 citrate Stable Isotopes CS-C-02138 1215071-03-6 Enquire
Desethyl Sildenafil D3 Stable Isotopes CS-T-52145 1346603-75-5 Enquire
Homo sildenafil-d5 (ethyl-d5) Stable Isotopes CS-P-04792 1216711-61-3 Enquire
Methisosildenafil-d4 Stable Isotopes CS-T-80255 1246819-66-8 Enquire
O-Desethyl O-Propyl Sildenafil-d3 Stable Isotopes CS-T-99307 Not Available Enquire
Pyrazole N-Demethyl Sildenafil-d3 Stable Isotopes CS-T-85129 1185044-03-4 Enquire
Thiosildenafil-d3 Stable Isotopes CS-T-86490 1216671-11-2 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Homo Sildenafil API CS-T-78715 642928-07-2 In Stock
Sildenafil API CS-O-31711 139755-83-2 In Stock
Sildenafil citrate API CS-O-30760 171599-83-0 In Stock


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Desethyl Sildenafil Metabolite CS-O-10905 139755-91-2 In Stock
N,N-Didesmethyl Sildenafil Metabolite CS-O-46085 324523-96-8 Enquire
N-Desmethyl sildenafil Metabolite CS-O-05840 139755-82-1 In Stock
Piperazine N, N-Desethyl Sildenafil Metabolite CS-O-46084 466684-88-8 Enquire
Thiodimethyl Sildenafil Metabolite CS-O-08164 1260112-90-0 In Stock
N-Desmethylsildenafil dihydrochloride Metabolite CS-EK-02929 1261395-01-0 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-Methyl-4-nitro-3-propylpyrazole-5-carboxamide Impurity CS-T-34289 139756-01-7 Enquire
4-(2-Ethoxybenzamido)-1-methyl-3-n-propylpyrazole-5-carboxam... Impurity CS-T-54307 139756-03-9 In Stock
4-[(2-Ethoxybenzoyl)amino]-1-methyl-5-propyl-1H-pyrazole-3-c... Impurity CS-T-77391 501120-38-3 In Stock
Dimethylsildenafil Impurity CS-O-48218 1416130-63-6 Enquire
Hydroxyhomo Sildenafil Impurity CS-T-78373 139755-85-4 In Stock
Norneo Sildenafil Impurity CS-T-83319 371959-09-0 In Stock
Norneosildenafil Impurity CS-B-00324 Not Available Enquire
Propoxyphenyl Homohydroxysildenafil Impurity CS-T-85493 139755-87-6 Enquire
Sildenafil Chlorosulfone Impurity CS-O-08159 139756-22-2 In Stock
Sildenafil Citrate Impurity 2 Impurity CS-O-14093 332374-42-2 In Stock
Sildenafil Citrate Impurity 3 Impurity CS-O-14094 332374-45-5 In Stock
Sildenafil Citrate Impurity-1 Impurity CS-O-08158 139756-02-8 In Stock
Sildenafil Dimer Impurity Impurity CS-DG-00019 1346602-67-2 In Stock
Sildenafil EP Impurity A Impurity CS-O-08160 1391053-95-4 In Stock
Sildenafil EP Impurity D Impurity CS-O-14710 1357931-55-5 In Stock
Sildenafil Methyl Sulfonate Ester Impurity Impurity CS-EO-03125 2512206-40-3 Enquire
Sildenafil open ring Impurity Impurity CS-O-43275 200575-15-1 Enquire
Sildenafil-N-Oxide Impurity CS-O-01446 1094598-75-0 In Stock
Udenafil Impurity 3 Impurity CS-P-01738 319491-68-4 In Stock
2-Ethoxybenzoyl chloride Impurity CS-O-08156 42926-52-3 Enquire
Benzyl Sildenafil Impurity CS-P-00354 1446089-82-2 Enquire
Chlorodenafil Impurity CS-T-11443 1058653-74-9 Enquire
De(methypiperazinyl) Sildenafil Dimer Impurity Impurity CS-T-51868 1346603-48-2 Enquire
Demethylpiperazinyl 7-Desoxo 7-Thioxosildenafil Sulfonic Aci... Impurity CS-T-15198 1353018-10-6 Enquire
Demethylpiperazinyl Desethyl Sildenafil Sulfonyl Chloride Impurity CS-T-15207 139756-27-7 Enquire
Demethylpiperazinyl Iso Sildenafil Sulfonyl Chloride Impurity CS-T-73856 501120-42-9 Enquire
Descarbonsildenafil Impurity CS-T-15923 1393816-99-3 Enquire
Desmethyl Thiosildenafil Impurity CS-T-89064 479073-86-4 Enquire
Hydroxythiohomo Sildenafil Impurity CS-K-00212 479073-82-0 Enquire
N-(Desmethyl)-tert-butyl Acetate Sildenafil Impurity CS-T-88449 398507-63-6 Enquire
O-Desethyl-O-propyl Methisosildenafil Impurity CS-T-73393 1391053-82-9 Enquire
Propoxyphenyl Sildenafil Impurity CS-P-00252 877777-10-1 Enquire
Propoxyphenyl Thiosildenafil Impurity CS-T-40727 479073-87-5 Enquire
Propoxyphenyl-thiohydroxyhomosildenafil Impurity CS-T-40726 479073-90-0 Enquire
Pyrazole N-Demethyl Sildenafil Impurity CS-T-85564 139755-95-6 Enquire
Sildenafil EP Impurity E Impurity CS-O-41518 5587-42-8 Enquire
Sildenafil Impurity 3 Impurity CS-EO-00729 1467610-65-6 Enquire
Sildenafil Related Compound Impurity CS-P-00253 Not Available Enquire
Thiohomo Sildenafil Impurity CS-T-44185 479073-80-8 Enquire


EP Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Sildenafil citrate (Y0001578) EP Standards CS-EG-03401 171599-83-0 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Ethoxybenzoic Acid Intermediate CS-T-22292 134-11-2 In Stock
5-(2-Ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro- 7H-pyraz... Intermediate CS-T-54350 139756-21-1 In Stock
Sildenafil Acid Impurity Intermediate CS-T-34288 139756-00-6 Enquire


Glucuronide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-Desmethyl Sildenafil N-Glucuronide Glucuronide CS-O-52732 ---- Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-nitro-1-nitroso-3-propyl-1H-pyrazole-5-carboxamide Nitrosamine CS-O-42917 Not Available Enquire
N-Nitroso N-desmethyl Sildenafil Nitrosamine CS-O-42896 Not Available In Stock
N-Nitroso Sildenafil Nitrosamine CS-O-42895 Not Available Enquire
N-Nitroso Sildenafil Impurity 1 Nitrosamine CS-EO-02718 Not Available Enquire
Nitroso-prodenafil Nitrosamine CS-P-08852 1266755-08-1 Enquire