Flomoxef Impurity 4 CAS 72591-95-8
| CAS No. | 72591-95-8 |
| Molecular Formula | C22H21ClN2O5 |
| Molecular Weight | 428.87 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.
CATO supplies Flomoxef Impurity 4 (CAS 72591-95-8), a pharmacopoeial impurity reference standard (molecular formula C22H21ClN2O5, MW 428.87 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Flomoxef Impurity 4 (C22H21ClN2O5) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 13.0, corresponding to approximately 13 ring(s) or double-bond equivalent(s). With a molecular weight of 428.87 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C22H21ClN2O5 |
| Molecular Weight | 428.87 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1977 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Flomoxef Standards
- Flomoxef Impurity 11 (CAS CATO-C4X-138211)
- Flomoxef Impurity 50 (CAS CATO-C4X-138250)
- Flomoxef Impurity 24 (CAS CATO-C4X-138224)
- Flomoxef Impurity 56 (CAS CATO-C4X-138256)
- Flomoxef Impurity 45 (CAS CATO-C4X-138245)
- Flomoxef Impurity 67 (CAS CATO-C4X-138267)
- Flomoxef Impurity 7 (CAS 2095697-76-8)
- Flomoxef Impurity 14 (CAS CATO-C4X-138214)
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Why CATO?
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