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 |
|---|---|---|---|---|
| Desethyl Sildenafil D3 | Stable Isotopes | CS-T-52145 | 1346603-75-5 | Enquire |
| Desmethyl Thiosildenafil D8 | Stable Isotopes | CS-EO-02367 | 1215321-44-0 | Enquire |
| Homo sildenafil-d5 (ethyl-d5) | Stable Isotopes | CS-P-04792 | 1216711-61-3 | Enquire |
| Iso Sildenafil-d3 | Stable Isotopes | CS-T-99191 | 1794829-17-6 | Enquire |
| Methisosildenafil-d4 | Stable Isotopes | CS-T-80255 | 1246819-66-8 | 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 | Not Available | 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 |
| Pyrazole N-Demethyl Sildenafil-d3 | Stable Isotopes | CS-T-85129 | 1185044-03-4 | 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-d8 | Stable Isotopes | CS-O-06963 | 951385-68-5 | In Stock |
| Thiosildenafil-d3 | Stable Isotopes | CS-T-86490 | 1216671-11-2 | Enquire |
API Standards
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Homo Sildenafil | API Standards | CS-T-78715 | 642928-07-2 | In Stock |
| Sildenafil | API Standards | CS-O-31711 | 139755-83-2 | In Stock |
| Sildenafil citrate | API Standards | CS-O-30760 | 171599-83-0 | In Stock |
Metabolites
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Desethyl Sildenafil | Metabolites | CS-O-10905 | 139755-91-2 | In Stock |
| N,N-Didesmethyl Sildenafil | Metabolites | CS-O-46085 | 324523-96-8 | Enquire |
| N-Desmethyl sildenafil | Metabolites | CS-O-05840 | 139755-82-1 | In Stock |
| N-Desmethylsildenafil dihydrochloride | Metabolites | CS-EK-02929 | 1261395-01-0 | Enquire |
| Piperazine N, N-Desethyl Sildenafil | Metabolites | CS-O-46084 | 466684-88-8 | Enquire |
| Thiodimethyl Sildenafil | Metabolites | CS-O-08164 | 1260112-90-0 | In Stock |
Impurities
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-Methyl-4-nitro-3-propylpyrazole-5-carboxamide | Impurities | CS-T-34289 | 139756-01-7 | Enquire |
| 4-nitro-1-nitroso-3-propyl-1H-pyrazole-5-carboxamide | Impurities | CS-O-42917 | Not Available | Enquire |
| Benzyl Sildenafil | Impurities | CS-P-00354 | 1446089-82-2 | Enquire |
| De(methypiperazinyl) Sildenafil Dimer Impurity | Impurities | CS-T-51868 | 1346603-48-2 | Enquire |
| Demethylpiperazinyl 7-Desoxo 7-Thioxosildenafil Sulfonic Aci... | Impurities | CS-T-15198 | 1353018-10-6 | Enquire |
| Demethylpiperazinyl Desethyl Sildenafil Sulfonyl Chloride | Impurities | CS-T-15207 | 139756-27-7 | Enquire |
| Demethylpiperazinyl Iso Sildenafil Sulfonyl Chloride | Impurities | CS-T-73856 | 501120-42-9 | Enquire |
| Descarbonsildenafil | Impurities | CS-T-15923 | 1393816-99-3 | Enquire |
| Desmethyl Thiosildenafil | Impurities | CS-T-89064 | 479073-86-4 | Enquire |
| Dimethylsildenafil | Impurities | CS-O-48218 | 1416130-63-6 | Enquire |
| Hydroxyhomo Sildenafil | Impurities | CS-T-78373 | 139755-85-4 | In Stock |
| Hydroxythiohomo Sildenafil | Impurities | CS-K-00212 | 479073-82-0 | Enquire |
| N-(Desmethyl)-tert-butyl Acetate Sildenafil | Impurities | CS-T-88449 | 398507-63-6 | Enquire |
| Nitroso-prodenafil | Impurities | CS-P-08852 | 1266755-08-1 | Enquire |
| N-Nitroso N-desmethyl Sildenafil | Impurities | CS-O-42896 | Not Available | In Stock |
| N-Nitroso Sildenafil | Impurities | CS-O-42895 | Not Available | Enquire |
| N-Nitroso Sildenafil Impurity 1 | Impurities | CS-EO-02718 | Not Available | Enquire |
| Norneo Sildenafil | Impurities | CS-T-83319 | 371959-09-0 | In Stock |
| Norneosildenafil | Impurities | CS-B-00324 | Not Available | Enquire |
| O-Desethyl-O-propyl Methisosildenafil | Impurities | CS-T-73393 | 1391053-82-9 | Enquire |
| Propoxyphenyl Homohydroxysildenafil | Impurities | CS-T-85493 | 139755-87-6 | Enquire |
| Propoxyphenyl Sildenafil | Impurities | CS-P-00252 | 877777-10-1 | Enquire |
| Propoxyphenyl Thiosildenafil | Impurities | CS-T-40727 | 479073-87-5 | Enquire |
| Propoxyphenyl-thiohydroxyhomosildenafil | Impurities | CS-T-40726 | 479073-90-0 | Enquire |
| Pyrazole N-Demethyl Sildenafil | Impurities | CS-T-85564 | 139755-95-6 | Enquire |
| Sildenafil Chlorosulfone | Impurities | CS-O-08159 | 139756-22-2 | In Stock |
| Sildenafil Citrate Impurity 2 | Impurities | CS-O-14093 | 332374-42-2 | In Stock |
| Sildenafil Citrate Impurity 3 | Impurities | CS-O-14094 | 332374-45-5 | In Stock |
| Sildenafil Citrate Impurity-1 | Impurities | CS-O-08158 | 139756-02-8 | In Stock |
| Sildenafil Dimer Impurity | Impurities | CS-DG-00019 | 1346602-67-2 | In Stock |
| Sildenafil EP Impurity A | Impurities | CS-O-08160 | 1391053-95-4 | In Stock |
| Sildenafil EP Impurity D | Impurities | CS-O-14710 | 1357931-55-5 | In Stock |
| Sildenafil EP Impurity E | Impurities | CS-O-41518 | 5587-42-8 | Enquire |
| Sildenafil Impurity 3 | Impurities | CS-EO-00729 | 1467610-65-6 | Enquire |
| Sildenafil Methyl Sulfonate Ester Impurity | Impurities | CS-EO-03125 | 2512206-40-3 | Enquire |
| Sildenafil open ring Impurity | Impurities | CS-O-43275 | 200575-15-1 | Enquire |
| Sildenafil Related Compound | Impurities | CS-P-00253 | Not Available | Enquire |
| Sildenafil-N-Oxide | Impurities | CS-O-01446 | 1094598-75-0 | In Stock |
| Thiohomo Sildenafil | Impurities | CS-T-44185 | 479073-80-8 | Enquire |
EP Standards
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Sildenafil citrate (Y0001578) | EP Standards | CS-EG-00676 | 171599-83-0 | Enquire |
| Sildenafil impurity A (Y0001579) | EP Standards | CS-EG-00647 | 1391053-95-4 | Enquire |
Intermediates
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-Methyl-4-nitro-3-propyl-1H-pyrazole-5-carboxylic Acid | Intermediates | CS-T-34288 | 139756-00-6 | Enquire |
| Methisosildenafil | Intermediates | CS-T-82285 | 496835-35-9 | Enquire |
| Thiosildenafil | Intermediates | CS-T-86367 | 479073-79-5 | Enquire |
Glucuronides
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| N-Desmethyl Sildenafil N-Glucuronide | Glucuronides | CS-O-52732 | Not Available | Enquire |