Sildenafil Impurity 97 CAS CATO-C4X-112897
| CAS No. | CATO-C4X-112897 |
| Molecular Formula | C22H30N6O4S |
| Molecular Weight | 474.58 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Sildenafil Impurity 97 (CAS CATO-C4X-112897) is a certified pharmaceutical impurity reference standard with the molecular formula C22H30N6O4S and a molecular weight of 474.58 g/mol.
Owing to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Sildenafil Impurity 97 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 474.58 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
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.
Physical & Chemical Properties
| Molecular Formula | C22H30N6O4S |
| Molecular Weight | 474.58 g/mol |
| Purity | 97%+ |
| 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 |
| Nitrogen Atoms | 6 |
| Sulfur Atoms | 1 |
Related Sildenafil Standards
- Sildenafil Impurity 293 (CAS CATO-C4X-1128293)
- Sildenafil (CAS 139755-83-2)
- Iso Sildenafil (CAS 253178-46-0)
- Sildenafil Impurity 75 (CAS 804518-64-7)
- Sildenafil Impurity 289 (CAS CATO-C4X-1128289)
- Sildenafil EP Impurity F-d8 (N-Desmethyl Sildenafil-d8) (CAS 1185168-06-2)
- Sildenafil Impurity 288 (CAS CATO-C4X-1128288)
- Sildenafil-d8 (CAS 951385-68-5)
Recommended Standards
- N-Desethyl-N-Methyl Vardenafil (CAS 224785-87-9)
- CAS 2562360-05-6 (CAS 2562360-05-6)
- Solvent Blue 104 (CAS 116-75-6)
- O-Tetrahydropyranyl Lubiprostone (CAS 876068-08-5)
- Salicylic Acid Impurity 4 (CAS CATO-C4X-19024)
- Landiolol Impurity 116 (CAS CATO-C4X-2621116)
- Pitavastatin Impurity 62 (CAS CATO-C4X-103762)
- N-ethyl-5-(1-phenoxyethyl)-1H-pyrazole-1-carboxamide (CAS 241127-12-8)
- [2-(2-Phenylethyl)phenyl]aminehydrochloride (CAS 107622-07-1)
- 5-Bromo-2,4-bis((4-nitrobenzyl)thio)pyrimidine (CAS 7249-22-1)
- Methyl 2-chloro-3-fluoropropanoate (CAS 14442-67-2)
- Rosuvastatin Impurity 123 (CAS 1112048-62-0)
- RMC6236 Intermediate 28 (CAS CATO-CIM-103916)
- Liraglutide Impurity 28 (CAS CATO-C4X-199228)
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