Flomoxef Impurity 5 CAS 134237-56-2
| CAS No. | 134237-56-2 |
| Molecular Formula | C25H23ClF2N2O6S |
| Molecular Weight | 552.97 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
As a process- or degradation-related impurity, Flomoxef Impurity 5 (CAS 134237-56-2, C25H23ClF2N2O6S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, fluorine/chlorine substitution, Flomoxef Impurity 5 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 552.97 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
As a certified reference material (CRM), Flomoxef Impurity 5 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 | C25H23ClF2N2O6S |
| Molecular Weight | 552.97 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1995 |
| Halogen Content | F/Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Flomoxef Standards
- Flomoxef Impurity 37 (CAS 68314-38-5)
- Flomoxef Impurity 3 (CAS 103057-61-0)
- Flomoxef Impurity 49 (CAS CATO-C4X-138249)
- Flomoxef Impurity 1 (CAS 68313-94-0)
- Flomoxef Impurity 53 (CAS CATO-C4X-138253)
- Flomoxef Impurity 28 (CAS CATO-C4X-138228)
- Flomoxef Impurity 15 (CAS CATO-C4X-138215)
- Flomoxef Impurity N2 (CAS 91177-27-4)
Recommended Standards
- 65181-78-4 (1,1'-Biphenyl)-4,4'-diamine, N4,N4'-bis(3-methylphenyl)-N4,N4'-diphenyl- (1,1'-Biphenyl)-4,4'-diamine, N,N'-bis(3-methylphenyl)-N,N'-diphenyl- N,N'-Diphenyl-N,N'-bis(3-methylphenyl)-(1,1'-diphenyl)-4,4'-diamine N,N'-Bis(3-methylphenyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine EC 413-810-8 (CAS 65181-78-4)
- Amlodipine Impurity 137 (CAS CATO-C4X-1095137)
- N-(4-(2-Chloro-5-methylpyrimidin-4-yl)phenyl)-N-(4-((2,2-difluoroacetamido)methyl)benzyl)-2,4-dihydroxybenzamide (CAS 1684386-71-7)
- Amlodipine Impurity 59 (CAS 140171-49-9)
- (R,S)-Formoterol Impurity (CAS 67346-51-4)
- Ethacridine Lactate Impurity 20 (CAS 92159-34-7)
- Fosaprepitant Impurity 2 (CAS CATO-C4X-11682)
- 4-(Bromomethyl)-3-ethyl-5-methylisoxazole (CAS 1256561-97-3)
- 1-(2,6-Dichlorophenyl)-3-[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]urea (CAS 2096998-34-2)
- 11α-Hydroxyallopregnane-3,20-dione (CAS 565-96-8)
- Dicyclohexylamine (R)-2-(Boc-amino)-4-pentenoate (CAS 221352-64-3)
- Methyl 2-bromo-5-((tert-butoxycarbonyl)amino)-4-methylbenzoate (CAS 2403843-09-2)
- 3-(6-Nitro-4H-1,3-benzodioxin-8-yl)-2-propenoic acid (CAS 869472-63-9)
- Boc-Cholecystokinin Octapeptide (desulfated) (A-1295.0001) (CAS 25687-34-7)
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