Epalrestat Impurity 21 CAS 5718-83-2
| CAS No. | 5718-83-2 |
| Molecular Formula | C5H5NO3S2 |
| Molecular Weight | 191.23 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C5H5NO3S2, Epalrestat Impurity 21 contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 191.23 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.
CATO supplies Epalrestat Impurity 21 (CAS 5718-83-2), a pharmacopoeial impurity reference standard (molecular formula C5H5NO3S2, MW 191.23 g/mol) used for the identification and quantification of trace impurities in APIs.
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.
CATO manufactures Epalrestat Impurity 21 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 | C5H5NO3S2 |
| Molecular Weight | 191.23 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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 |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 2 |
Related Epalrestat Standards
- Epalrestat impurity 28 (CAS 179027-75-9)
- Epalrestat Impurity 12 (CAS 109801-00-5)
- Epalrestat impurity 33 (CAS 39486-57-2)
- Epalrestat Impurity 54 (CAS 1408072-62-7)
- Epalrestat impurity 32 (CAS CATO-C4X-223632)
- Epalrestat Impurity 19 (CAS 149789-77-5)
- Epalrestat Impurity 14 (CAS 31061-24-2)
- Epalrestat Impurity 61 (CAS CATO-C4X-223661)
Recommended Standards
- Cabozantinib Impurity 1 (CAS CATO-C4X-20181)
- (R)-N-Nitroso Anabasine (CAS 1795786-06-9)
- Carteolol Impurity 33 (CAS 34685-03-5)
- Teneligliptin impurity 58 (CAS CATO-C4X-176058)
- Ilaprazole impurity 202 (CAS CATO-C4X-1130202)
- Ulipristal Impurity 7 (CAS 709615-25-8)
- Dopamine Impurity 26 (CAS 3131-52-0)
- Elagolix-13C-d3 Sodium Salt (CAS 832720-36-2(unlabelled))
- Methyl Indole-4-carboxylate (CAS 39830-66-5)
- 5-(1-Methoxycyclobutyl)-1-methyl-1H-pyrazole-3-sulfonamide (CAS 2428478-76-4)
- 2-(2-Hydroxyphenyl)-N'-[(1E)-(4-nitrophenyl)methylidene]furan-3-carbohydrazide (CAS 343375-11-1)
- Ethyl 5-chlorooctafluoropentanoate (CAS 1555-27-7)
- Gadoteridol Impurity 16 (CAS CATO-C4X-225716)
- Bonemarrow-Derived Mesenchymal Stem Cells Affinity Peptide trifluoroacetate salt (CAS 683750-83-6)
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