Sildenafil Impurity 16 CAS 1971915-89-5
| CAS No. | 1971915-89-5 |
| Molecular Formula | C19H24N4O5S |
| Molecular Weight | 420.48 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
Sildenafil Impurity 16 (CAS 1971915-89-5) is a certified pharmaceutical impurity reference standard with the molecular formula C19H24N4O5S and a molecular weight of 420.48 g/mol.
Based on its molecular formula C19H24N4O5S, Sildenafil Impurity 16 contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 420.48 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
CATO manufactures Sildenafil Impurity 16 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C19H24N4O5S |
| Molecular Weight | 420.48 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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1996 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Sildenafil Standards
- Sildenafil Impurity 102 (CAS CATO-C4X-1128102)
- Sildenafil Impurity 282 (CAS CATO-C4X-1128282)
- Sildenafil Impurity 98 (CAS CATO-C4X-112898)
- Sildenafil Impurity 255 (CAS CATO-C4X-1128255)
- Sildenafil Impurity 86 (CAS CATO-C4X-112886)
- Sildenafil Impurity 256 (CAS 1027192-9-2)
- Sildenafil Impurity 94 (CAS CATO-C4X-112894)
- Sildenafil Impurity 6 (CAS 501120-42-9)
Recommended Standards
- Vardenafil Impurity 14 (CAS CATO-C4X-101714)
- Z-HIs-met-oh (CAS 2641-13-6)
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- Sulfo-SPP (CAS 452072-27-4)
- Indobufen Impurity 43 (CAS CATO-C4X-179243)
- Creatine impurity 17 (CAS CATO-C4X-120917)
- Etizolam Impurity 5 (CAS CATO-C4X-35095)
- 2-[n-(butan-2-yl)2-chloropyridine-3-sulfonamido]acetic acid (CAS 1179972-08-7)
- 1-[(3,5-Difluorophenyl)methyl]-3-nitro-1h-pyrazole (CAS 1240568-37-9)
- 5-(Methylsulfonyl)pyridin-2-amine (CAS 35196-11-3)
- 4-(2,2-Difluoroethyl)thiomorpholine-3-carboxylic acid (CAS 1543428-68-7)
- tert-Butyl 4-((6-ethoxypyrimidin-4-yl)(methyl)amino)piperidine-1-carboxylate (CAS 1353974-00-1)
- 3-Chloro-4-(methylsulfonyl)thiophene-2-carbonyl chloride (CAS 175201-87-3)
- Ac-(5-31)Semaglutide (CAS CATO-C4X-2226279)
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 18665070610 / Nicole.chen@cato-chem.com