Febuxostat Impurity 63 CAS CATO-C4X-116263
| CAS No. | CATO-C4X-116263 |
| Molecular Formula | C18H23NO4S |
| Molecular Weight | 349.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Febuxostat Impurity 63 (C18H23NO4S) 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).
Febuxostat Impurity 63 (CAS CATO-C4X-116263) is a certified pharmaceutical impurity reference standard with the molecular formula C18H23NO4S and a molecular weight of 349.44 g/mol.
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 certified reference material (CRM), Febuxostat Impurity 63 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 | C18H23NO4S |
| Molecular Weight | 349.44 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Febuxostat Standards
- Febuxostat Impurity 65 (CAS CATO-C4X-116265)
- Febuxostat Impurity 43 (CAS 161798-03-4)
- Febuxostat Impurity 60 (CAS 2230270-03-6)
- Febuxostat Impurity 81 (CAS 2375033-31-9)
- Febuxostat Impurity 89 (CAS CATO-C4X-116289)
- Febuxostat Impurity 99 (CAS CATO-C4X-116299)
- Febuxostat impurity 91 (CAS 1380049-42-2)
- Febuxostat Impurity 13 (CAS 160844-75-7)
Recommended Standards
- 4-Propoxy-N-((tetrahydrofuran-2-yl)methyl)naphthalene-1-sulfonamide (CAS 902249-26-7)
- Avibactam impurity 112 (CAS 1416134-58-1&1463522-16-8)
- 2-Fluoro-4-methyl-3-oxo-4-aza-5α-androst-1-ene-17β-carboxylic acid (CAS 606101-79-5)
- Avibactam Impurity 132 (CAS CATO-C4X-1348132)
- Cilastatin Impurity 48 (CAS CATO-C4X-196048)
- Cefazolin Impurity 68 (CAS CATO-C4X-157768)
- Omeprazole Impurity 26 (CAS 142885-92-5)
- Atorvastatin Calcium EP Impurity P (CAS 581772-29-4)
- 1-(3-Amino-4-methoxyphenyl)ethanone (CAS 6318-64-5)
- Methyl 4-Bromo-2-nitrobenzoate (CAS 158580-57-5)
- 5-Bromo-5-deoxy-2,3-isopropylidene-D-ribonolactone (CAS 94324-23-9)
- ((3AR,5R,6aR)-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)methanol (CAS 14260-66-3)
- (6R,8R)-2,4-Dichloro-7,7-dimethyl-5,6,7,8-tetrahydro-6,8-methanoquinoline-3-carbonitrile (CAS 2768872-20-2)
- Liraglutide Impurity 22 (CAS 536721-25-2)
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