Febuxostat Impurity 43 CAS 161798-03-4
| CAS No. | 161798-03-4 |
| Molecular Formula | C18H21NO4S |
| Molecular Weight | 347.43 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Febuxostat Impurity 43.
As a process- or degradation-related impurity, Febuxostat Impurity 43 (CAS 161798-03-4, C18H21NO4S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Febuxostat Impurity 43 (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 aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 43 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 | 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 |
| CAS Registry Year (est.) | 2003 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Febuxostat Standards
- 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 65 (CAS CATO-C4X-116265)
- Febuxostat Impurity 63 (CAS CATO-C4X-116263)
- Febuxostat Impurity 13 (CAS 160844-75-7)
Recommended Standards
- Propan-2-yl 3-{3-amino-6-methyl-5H,6H,7H,8H-thieno[2,3-b]1,6-naphthyridin-2-yl}-3-oxopropanoate (CAS 625371-50-8)
- N-benzyl-N-(3-(hydroxymethyl)oxetan-3-yl)-4-methylbenzenesulfonamide (CAS 2095219-05-7)
- N1-(2-(Dimethylamino)-2-(thiophen-3-yl)ethyl)-N2-(2-methoxyphenyl)oxalamide (CAS 946200-09-5)
- N-(5-Cyclohexyl-1,3,4-thiadiazol-2-yl)-2,6-dimethoxybenzamide (CAS 82559-44-2)
- Vardenafil Impurity 47 (CAS 910554-78-8)
- Bilastine Impurity 13 (CAS 1215537-40-8（free base）)
- Estradiol Valerate Impurity 20 (CAS CATO-C4X-284220)
- 1-Methoxycycloheptatriene (CAS 1728-32-1)
- 2-(Bromomethyl)-4-methylbenzo[d]oxazole (CAS 1804104-72-0)
- Rilpivirine Keto Impurity (CAS 189956-45-4)
- 4-(4-Propylcyclohexyl)benzoic acid (CAS 88561-78-8)
- 5856-66-6 Tetrapentacontane DTXSID80334754 (CAS 5856-66-6)
- n-Octyl-d17 Alcohol (CAS 153336-13-1)
- D-Glu3-Tirzepatide (CAS CATO-CPTD788927)
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