Cefdinir USP Impurity A CAS 178949-03-6
| CAS No. | 178949-03-6 |
| Molecular Formula | C7H8N4O4S |
| Molecular Weight | 244.23 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
As a process- or degradation-related impurity, Cefdinir USP Impurity A (CAS 178949-03-6, C7H8N4O4S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C7H8N4O4S, Cefdinir USP Impurity A contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 244.23 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.
As a certified reference material (CRM), Cefdinir USP Impurity A meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C7H8N4O4S |
| Molecular Weight | 244.23 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2008 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Cefdinir Standards
- Cefdinir Impurity 53 (CAS 178422-40-7)
- Cefdinir CP Impurity C (CAS 79349-82-9)
- Cefdinir Impurity 37 (CAS CATO-C4X-121037)
- Cefdinir Impurity 74 (CAS CATO-C4X-121074)
- Cefdinir Impurity 38 (CAS 37155-50-3)
- Cefdinir Impurity 81 (CAS 137171-77-8)
- Cefdinir Impurity 52 (CAS 66338-96-3)
- Cefdinir CP Impurity A (CAS 1450758-21-0)
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- 1-Chloro-7-naphthol (CAS 29921-50-4)
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- Butyl[(4-chlorophenyl)methyl]amine hydrochloride (CAS 2298-58-0)
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