Febuxostat Impurity 55 CAS CATO-C4X-116255
| CAS No. | CATO-C4X-116255 |
| Molecular Formula | C18H20N2O3S |
| Molecular Weight | 344.43 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.
CATO supplies Febuxostat Impurity 55 (CAS CATO-C4X-116255), a pharmacopoeial impurity reference standard (molecular formula C18H20N2O3S, MW 344.43 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C18H20N2O3S, Febuxostat Impurity 55 contains a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 344.43 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
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.
Physical & Chemical Properties
| Molecular Formula | C18H20N2O3S |
| Molecular Weight | 344.43 g/mol |
| Purity | 97%+ |
| 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 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Febuxostat Standards
- Febuxostat Impurity 13 (CAS 160844-75-7)
- Febuxostat Impurity 53 (CAS 2230270-05-8)
- Febuxostat Impurity 54 (CAS 2375033-35-3)
- Febuxostat impurity 91 (CAS 1380049-42-2)
- Febuxostat Impurity 99 (CAS CATO-C4X-116299)
- Febuxostat Impurity 43 (CAS 161798-03-4)
- Febuxostat Impurity 60 (CAS 2230270-03-6)
- Febuxostat Impurity 81 (CAS 2375033-31-9)
Recommended Standards
- Cefazedone Impurity 11 (CAS CATO-C4X-117111)
- Cefazedone impurity 15 (CAS 3004928-24-6)
- Olanzapine Impurity 37 (CAS CATO-C4X-117837)
- Amisulpride Impurity 56 (CAS CATO-C4X-104556)
- Iguratimod Impurity 34 (CAS CATO-C4X-182634)
- Perampanel impurity 50 (CAS CATO-C4X-243050)
- Betamethasone Impurity 127 (CAS CATO-C4X-1437127)
- Cyflufenamid (CAS 180409-60-3)
- 2-(5-Fluoro-2-methyl-3-nitrophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 1418128-32-1)
- 3-(Tert-butyl)-1-(2,4-dichlorobenzyl)-1H-pyrazole-5-carbonyl chloride (CAS 306937-15-5)
- 2-(TERT-BUTOXYCARBONYL(2-HYDROXYETHYL)AMINO)ACETIC ACID (CAS 189160-67-6)
- Ethyl 5-cyano-3,4-dimethylthieno[2,3-b]thiophene-2-carboxylate (CAS 175202-57-0)
- Paliperidone Impurity 86 (CAS CATO-C4X-172486)
- Liraglutide Impurity 10 TFA Salt (CAS CATO-C4X-199210)
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