Epalrestat Impurity 22 CAS 2041-59-0
| CAS No. | 2041-59-0 |
| Molecular Formula | C3H3NO2S2 |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Epalrestat Impurity 22 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.
As a process- or degradation-related impurity, Epalrestat Impurity 22 (CAS 2041-59-0, C3H3NO2S2H4N) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C3H3NO2S2H4N, Epalrestat Impurity 22 contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage; these features give the compound characteristic functional-group stretching vibrations in infrared spectroscopy. The molecular weight of 167.22 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C3H3NO2S2 2*H4N |
| Molecular Weight | 167.22 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 | Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 1.5 |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
Related Epalrestat Standards
- Epalrestat Impurity 12 (CAS 109801-00-5)
- Epalrestat Impurity 4 (CAS 1151944-57-8)
- Epalrestat impurity 40 Ammonium Salt (CAS 116636-84-1(Free acid）)
- Epalrestat Impurity 6 (CAS 124782-63-4)
- Epalrestat (E,Z)-Isomer (CAS 124782-64-5)
- Epalrestat Impurity 1 (CAS 130786-32-2)
- Epalrestat Impurity 54 (CAS 1408072-62-7)
- Epalrestat Impurity 21 (CAS 1431637-29-4)
Recommended Standards
- Voriconazole Impurity 61 (CAS CATO-C4X-136661)
- Nicotine EP Impurity E (Mixture of Diastereomers) (CAS 491-26-9)
- vbAvatrombopag Impurity 55 (CAS 29006-00-6)
- Methyl 2-(3-(3-(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acetate (CAS 1416342-42-1)
- Sodium 2,3-dihydro-1,4-benzodioxine-6-sulfinate (CAS 1514973-39-7)
- 2-(5-Bromo-2-ethoxybenzenesulfonyl)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid (CAS 1008962-07-9)
- N-(1,1-Dioxido-1,2-benzisothiazol-3-yl)-4-methylbenzenesulfonohydrazide (CAS 13255-93-1)
- 2-Chloro-6-ethylisonicotinoyl chloride (CAS 89938-71-6)
- Ethyl 7-methyl-5-phenyl-2,3-dihydro-5h-thiazolo[3,2-a]pyrimidine-6-carboxylate hydrobromide (CAS 123044-25-7)
- Semaglutide impurity 70 (CAS CATO-C4X-222670)
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