Febuxostat Impurity 71 CAS 923942-34-1
| CAS No. | 923942-34-1 |
| Molecular Formula | C17H18N2O3S |
| Molecular Weight | 330.40 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Febuxostat Impurity 71 (C17H18N2O3S) contains a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO supplies Febuxostat Impurity 71 (CAS 923942-34-1), a pharmacopoeial impurity reference standard (molecular formula C17H18N2O3S, MW 330.40 g/mol) used for the identification and quantification of trace impurities in APIs.
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
CATO manufactures Febuxostat Impurity 71 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 | C17H18N2O3S |
| Molecular Weight | 330.40 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°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.) | 1987 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Febuxostat Standards
- Febuxostat Impurity 77 (CAS CATO-C4X-116277)
- Febuxostat Impurity 88 (CAS 144060-84-4)
- Febuxostat Impurity 76 (CAS CATO-C4X-116276)
- Febuxostat 67M-2 (CAS 407582-47-2)
- Febuxostat Impurity 61 (CAS 2418591-42-9)
- Febuxostat Impurity 85 (CAS CATO-C4X-116285)
- Febuxostat Impurity 94 (CAS CATO-C4X-116294)
- Febuxostat Impurity 10 (CAS 1239233-86-3)
Recommended Standards
- Esomeprazole impurity 126 (CAS CATO-C4X-1112126)
- tert-butyl N-{3-[2-(methanesulfonyloxy)propyl]pyridin-4-yl}carbamate (CAS 257937-11-4)
- tert-Butyl ((1R,2S)-1-((cyclopropylsulfonyl)carbamoyl)-2-vinylcyclopropyl)carbamate, 97% (CAS 630421-48-6)
- Ranitidine EP Impurity C (CAS 73851-70-4)
- Remdesivir Impurity 5 (CAS 1191237-69-0)
- Lubiprostone Impurity 36 (CAS 321457-71-0)
- 7-AVCA Impurity 2 (CAS 33748-00-4)
- GSK 2250665A (CAS 1246030-96-5)
- (1-((3-(Difluoromethyl)piperidin-1-yl)methyl)cyclopropyl)methanol (CAS 2882104-22-3)
- 2-(2,3-Dihydrobenzofuran-6-yl)acetonitrile (CAS 1083168-70-0)
- 4-(4-(Diethylamino)styryl)-N,N-diphenylaniline (CAS 100463-48-7)
- 2-Fluoro-4-phenylbenzaldehyde (CAS 183436-80-8)
- Methyl 7-Methoxy-2-methylbenzoxazole-5-carboxylate (CAS 1197944-26-5)
- β-Asp9-Tirzepatide (CAS CATO-CPTD788931)
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