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.
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 |