Febuxostat Impurity 89 CAS CATO-C4X-116289
| CAS No. | CATO-C4X-116289 |
| Molecular Formula | C18H21NO4S |
| Molecular Weight | 347.43 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.
As a process- or degradation-related impurity, Febuxostat Impurity 89 (CAS CATO-C4X-116289, C18H21NO4S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Febuxostat Impurity 89 (C18H21NO4S) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
As a certified reference material (CRM), Febuxostat Impurity 89 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C18H21NO4S |
| Molecular Weight | 347.43 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Febuxostat Standards
- Febuxostat Impurity 43 (CAS 161798-03-4)
- Febuxostat Impurity 60 (CAS 2230270-03-6)
- Febuxostat Impurity 81 (CAS 2375033-31-9)
- Febuxostat Impurity 99 (CAS CATO-C4X-116299)
- Febuxostat impurity 91 (CAS 1380049-42-2)
- Febuxostat Impurity 65 (CAS CATO-C4X-116265)
- Febuxostat Impurity 63 (CAS CATO-C4X-116263)
- Febuxostat Impurity 13 (CAS 160844-75-7)
Recommended Standards
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