Sildenafil Impurity 51 CAS 263897-18-3
Purity >95%In StockPharmacopoeial Impurity Standards
| CAS No. | 263897-18-3 |
| Molecular Formula | C21H28N6O4S |
| Molecular Weight | 460.55 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Sildenafil Impurity 51 (CAS 263897-18-3), a pharmacopoeial impurity standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C21H28N6O4S. Molecular weight: 460.55 g/mol. Batch-specific COA and technical support are available on request.
Physical & Chemical Properties
| Molecular Formula | C21H28N6O4S |
| Molecular Weight | 460.55 g/mol |
| Purity | >95% |
| 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.) | 2025 |
| Nitrogen Atoms | 6 |
| Sulfur Atoms | 1 |
Related Sildenafil Standards
- Sildenafil EP Impurity F (CAS 139755-82-1)
- Sildenafil Impurity 30 (CAS 139755-95-6)
- Sildenafil Impurity 303 (CAS CATO-C4X-1128303)
- Sildenafil Impurity 291 (CAS CATO-C4X-1128291)
- Sildenafil Impurity 283 (CAS CATO-C4X-1128283)
- Sildenafil Impurity 10 (CAS 1393816-99-3)
- Sildenafil Impurity 290 (CAS CATO-C4X-1128290)
- Sildenafil Impurity 245 (CAS CATO-C4X-1128245)
Recommended Standards
- Vardenafil Impurity 66 (CAS CATO-C4X-101766)
- Vardenafil EP Impurity A (CAS 2169247-39-4)
- Lubiprostone impurity 5 (CAS CATO-C4X-11365)
- Ozanimod Impurity 19 (CAS 2251699-84-8)
- Fluvastatin EP Impurity G (CAS 101125-34-2)
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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