Sildenafil EP Impurity C CAS 139755-91-2
Purity >80%In StockPharmacopoeial Impurity Standards
| CAS No. | 139755-91-2 |
| Molecular Formula | C20H26N6O4S |
| Molecular Weight | 446.52 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Sildenafil EP Impurity C (CAS 139755-91-2), a pharmacopoeial impurity standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C20H26N6O4S. Molecular weight: 446.52 g/mol. Batch-specific COA and technical support are available on request.
Physical & Chemical Properties
| Molecular Formula | C20H26N6O4S |
| Molecular Weight | 446.52 g/mol |
| Purity | >80% |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1996 |
| Nitrogen Atoms | 6 |
| Sulfur Atoms | 1 |
Related Sildenafil Standards
- Sildenafil Impurity 284 (CAS CATO-C4X-1128284)
- Sildenafil Impurity 270 (CAS 1229017-26-8)
- Sildenafil Impurity 271 (CAS 1229017-15-5)
- Sildenafil Impurity 285 (CAS CATO-C4X-1128285)
- Sildenafil Impurity 295 (CAS CATO-C4X-1128295)
- Sildenafil Impurity 280 (CAS CATO-C4X-1128280)
- Sildenafil Impurity 95 (CAS CATO-C4X-112895)
- Sildenafil Impurity 245 (CAS CATO-C4X-1128245)
Recommended Standards
- Vardenafil Impurity 48 (CAS 224785-72-2)
- Mizolastine Impurity 9 (CAS CATO-C4X-20069)
- tert-Butyl 4-{[(4E)-4-[(2H-1,3-benzodioxol-5-yl)methylidene]-5-oxo-2-sulfanylideneimidazolidin-1-yl]methyl}piperazine-1-carboxylate (CAS 865659-64-9)
- Nicergoline Impurity 15 (CAS CATO-C4X-208515)
- Esmolol Impurity 29 (CAS CATO-C4X-189129)
- 2-(3,5-Dimethyl-1H-pyrazole-1-carbonyl)-N-(4-ethylphenyl)-N-methyl-4-phenylthiophene-3-sulfonamide (CAS 1173745-62-4)
- 3-(3-Methoxyphenyl)pentan-3-ol (CAS 74385-17-4)
- N-(2,4-difluorobenzyl)thietan-3-amine (CAS 1872979-58-2)
- (3a'S,7a'R)-1'-Benzyloctahydrospiro[[1,3]dioxolane-2,5'-indole] (CAS 1260608-58-9)
- Liraglutide Impurity 26 (CAS CATO-C4X-199226)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 13829788188 / jacky.chen@cato-chem.com