Cefepime EP Impurity B CAS 2923899-40-3
| CAS No. | 2923899-40-3 |
| Molecular Formula | C25H29N9O7S3 |
| Molecular Weight | 663.75 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Cefepime EP Impurity B (CAS 2923899-40-3, C25H29N9O7S3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Structurally, Cefepime EP Impurity B (C25H29N9O7S3) 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 16.0, corresponding to approximately 16 ring(s) or double-bond equivalent(s). With a molecular weight of 663.75 g/mol, it falls into the high-molecular-weight range. 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 | C25H29N9O7S3 |
| Molecular Weight | 663.75 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) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2004 |
| Nitrogen Atoms | 9 |
| Sulfur Atoms | 3 |
Related Cefepime Standards
- Cefepime Impurity 16 (CAS CATO-C4X-119316)
- Cefepime EP Impurity B (CAS CATO-C4X-11932)
- Cefepime Impurity 30 (CAS CATO-C4X-119330)
- Cefepime Impurity 32 (CAS CATO-C4X-119332)
- Cefepime Impurity 41 (CAS CATO-C4X-119341)
- Cefepime Impurity 25 (CAS CATO-C4X-119325)
- Cefepime Impurity 38 (CAS CATO-C4X-119338)
- Cefepime EP Impurity F (CAS CATO-C4X-11936)
Recommended Standards
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- N-(Boc-PEG2)-N-bis(PEG3-azide) (CAS 2353409-46-6)
- Fmoc-NH-PEG8-CH2CH2COOH (CAS 756526-02-0)
- Z-Gly-Pro-Phe-Pro-Leu-OH (CAS 61867-13-8)
- Posaconazole Impurity 25 (CAS 1042398-26-4)
- Levocarnitine Impurity 15 (CAS 931426-07-2)
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- 1-{5H,6H,7H,8H-[1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl}-1H-pyrazol-4-amine (CAS 1521340-43-1)
- 1,3-Diphenyl-4,5-dihydro-1H-pyrazole-5-carbonitrile (CAS 3426-35-5)
- 2-Amino-2-methyl-N-(3-(methylsulfonyl)phenyl)propanamide hydrochloride (CAS 1829880-51-4)
- 4-Chloro-N-cyclopropyl-2-fluorobenzamide (CAS 1090552-62-7)
- 4-(3,5-Dimethyl-1H-pyrazole-1-carbonyl)-2-methoxyphenol (CAS 955965-31-8)
- 2-Cyclopropyl-5-(pyrrolidin-3-yl)-1,3,4-oxadiazole (CAS 1225218-55-2)
- Fibrinopeptide A, human TFA (CAS 61533-47-9)
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