Epalrestat Impurity 52 CAS CATO-C4X-223652
| CAS No. | CATO-C4X-223652 |
| Molecular Formula | C5H6ClNO4S2 |
| Molecular Weight | 243.69 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Epalrestat Impurity 52 (CAS CATO-C4X-223652), a pharmacopoeial impurity reference standard (molecular formula C5H6ClNO4S2, MW 243.69 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a carbohydrate-derived structure, an amide group, a sulfone group, chlorine substitution, Epalrestat Impurity 52 is typically white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 243.69 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
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.
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.
Physical & Chemical Properties
| Molecular Formula | C5H6ClNO4S2 |
| Molecular Weight | 243.69 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 2 |
Related Epalrestat Standards
- Epalrestat Impurity 1 (CAS 130786-32-2)
- Epalrestat impurity 37 (CAS CATO-C4X-223637)
- Epalrestat Impurity 45 (CAS CATO-C4X-223645)
- Epalrestat Impurity 53 (CAS CATO-C4X-223653)
- Epalrestat Impurity 20 (CAS 23176-01-4)
- Epalrestat impurity 35 (CAS CATO-C4X-223635)
- Epalrestat Impurity 43 (CAS CATO-C4X-223643)
- Epalrestat Impurity 61 (CAS CATO-C4X-223661)
Recommended Standards
- Osimertinib Impurity 14 (CAS 2364486-23-5)
- 2-(2-Chloro-6-fluorophenyl)-5,5-dimethylmorpholine (CAS 1017481-19-4)
- Minoxidil Impurity 34 (CAS 2889432-05-5)
- 4-(1-cyano-1-methylethyl)benzene-1-sulfonyl chloride (CAS 1039715-62-2)
- Roxadustat Impurity 64 (CAS 1509958-11-5)
- Vitamin K1 Impurity 67 (CAS 4444-14-8)
- Nintedanib Impurity 171 (CAS CATO-C4X-1814171)
- sodium 2-[(1-benzyl-1H-imidazol-2-yl)sulfanyl]acetate (CAS 1803598-72-2)
- 2-(4-Benzylpiperazin-1-yl)-N-(2-ethoxyphenyl)acetamide (CAS 647031-45-6)
- 2-Methyloxazolo[5,4-d]pyrimidine-5,7(4H,6H)-dione (CAS 1015697-99-0)
- tert-Butyl 2-methyl-3-[(pentan-3-yl)amino]propanoate (CAS 1221342-45-5)
- 2-(4,4-Difluoropiperidin-1-yl)-4-(trifluoromethyl)pyridine (CAS 1707581-22-3)
- 1-Chloro-4-(difluoro(phenyl)methyl)benzene (CAS 55805-07-7)
- Des-Pro36-37-Tirzepatide (CAS CATO-CPTD788938)
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