Cefoxitin Impurity 36 (S-Isomer) CAS CATO-C4X-157836
| CAS No. | CATO-C4X-157836 |
| Molecular Formula | C15H16N2O6S2 |
| Molecular Weight | 384.43 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 Cefoxitin Impurity 36 (S-Isomer).
Cefoxitin Impurity 36 (S-Isomer) (CAS CATO-C4X-157836) is a certified pharmaceutical impurity reference standard with the molecular formula C15H16N2O6S2 and a molecular weight of 384.43 g/mol.
The molecular framework of Cefoxitin Impurity 36 (S-Isomer) (C15H16N2O6S2) is characterized by a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C15H16N2O6S2 |
| Molecular Weight | 384.43 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 | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
Related Cefoxitin Standards
- Cefoxitin EP Impurity A (CAS 1158963-31-5)
- Cefoxitin EP Impurity A (CAS 54333-94-7)
- Cefoxitin Impurity 35 (R-Isomer) (CAS CATO-C4X-157835)
- Cefoxitin Impurity 27 (CAS CATO-C4X-157827)
- Cefoxitin Impurity 28 (CAS CATO-C4X-157828)
- Cefoxitin Impurity 34 (CAS CATO-C4X-157834)
- Cefoxitin Impurity 52 (CAS CATO-C4X-157852)
- Cefoxitin Impurity 55 (CAS CATO-C4X-157855)
Recommended Standards
- Bisacodyl Impurity 8 (CAS CATO-C4X-20378)
- Pemafibrate Impurity 21 (CAS CATO-C4X-290321)
- Rilpivirine Amide (CAS 500288-66-4)
- Pemafibrate Impurity 23 (CAS CATO-C4X-290323)
- Crizotinib Impurity 49 (CAS CATO-C4X-102549)
- Thiamphenicol Impurity 6 (CAS 21079-44-7)
- Halobetasol Impurity 7 (CAS 32232-54-5)
- Sodium 8-chloronaphthalene-1-sulfonate (CAS 5439-85-0)
- 3-(4-Bromophenyl)-5-(2-fluorophenyl)-1,2,4-oxadiazole (CAS 419553-16-5)
- Neostigmine Impurity 49 (CAS CATO-C4X-204249)
- Repaglinide EP Impurity C N-acetyl-glutarate (CAS 219921-94-5)
- N-(tert-Butyl)-4-chlorobenzenesulfonamide (CAS 29083-03-2)
- 3-Amino-4-oxo-N-((3-((4-oxo-2-(((tetrahydrofuran-2-yl)methyl)carbamoyl)quinazolin-3(4H)-yl)amino)furan-2-yl)methyl)-3,4-dihydroquinazoline-2-carboxamide (CAS 646497-34-9)
- Tetrapeptide-3 (CAS 827306-97-8)
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