Cefpodoxime Proxetil Impurity 20 CAS CATO-C4X-157920
| CAS No. | CATO-C4X-157920 |
| Molecular Formula | C24H27N7O9S3 |
| Molecular Weight | 653.71 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.
Cefpodoxime Proxetil Impurity 20 (CAS CATO-C4X-157920) is a certified pharmaceutical impurity reference standard with the molecular formula C24H27N7O9S3 and a molecular weight of 653.71 g/mol.
Structurally, Cefpodoxime Proxetil Impurity 20 (C24H27N7O9S3) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 15.0, corresponding to approximately 15 ring(s) or double-bond equivalent(s). With a molecular weight of 653.71 g/mol, it falls into the high-molecular-weight range. 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 | C24H27N7O9S3 |
| Molecular Weight | 653.71 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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) | 15.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 7 |
| Sulfur Atoms | 3 |
Related Cefpodoxime Standards
- Cefpodoxime Proxetil Impurity 23 (CAS CATO-C4X-157923)
- Cefpodoxime Proxetil Impurity 12 (CAS CATO-C4X-157912)
- Cefpodoxime Proxetil Impurity 19 (CAS CATO-C4X-157919)
- Cefpodoxime Proxetil Impurity 30 (CAS CATO-C4X-157930)
- Cefpodoxime Impurity 54 (CAS CATO-C4X-157954)
- Cefpodoxime Proxetil Impurity 8 (CAS 1192365-87-9)
- Cefpodoxime Proxetil Impurity 33 (Mixture of Diastereomers) (CAS CATO-C4X-157933)
- Cefpodoxime Impurity 52 (CAS CATO-C4X-157952)
Recommended Standards
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- Bedaquiline Impurity 29 (CAS CATO-C4X-116729)
- methyl 2-(5-oxo-4,5-dihydro-1H-pyrazol-3-yl)acetate (CAS 501006-40-2)
- Papaverine Impurity 46 (CAS CATO-C4X-206746)
- Titanyl(IV) sulfate solution (CAS 13825-74-6)
- tert-Butyl (3,6-dibromopyridin-2-yl)carbamate (CAS 1823269-76-6)
- 2-chloranyl-3,3,3-tris(fluoranyl)prop-1-ene 2-chloro-3,3,3-trifluoro-1-propene 2730-62-3 A819002 (CAS 2730-62-3)
- Taurine Impurity 2 (CAS 83982-06-3)
- Lixisenatide (CAS 320367-13-3（free base）)
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