Oxazepam EP impurity A CAS 19554-95-1
| CAS No. | 19554-95-1 |
| Molecular Formula | C15H11ClN2O2 |
| Molecular Weight | 286.71 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, Oxazepam EP impurity A (CAS 19554-95-1, C15H11ClN2O2) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, Oxazepam EP impurity A is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 286.71 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).
CATO manufactures Oxazepam EP impurity A under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C15H11ClN2O2 |
| Molecular Weight | 286.71 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Oxazepam Standards
Recommended Standards
- 4-(4-Fluorophenoxy)benzenesulfonyl chloride (CAS 192329-91-2)
- 5-(Chloromethyl)-3-(2-phenoxyphenyl)-1,2,4-oxadiazole (CAS 1956324-24-5)
- tert-Butyl N-(3-chloro-4-nitrophenyl)-N-methylcarbamate (CAS 1881290-18-1)
- 6-((tert-Butoxycarbonyl)(methyl)amino)-5-chloronicotinic acid (CAS 1956335-12-8)
- Etoposide EP Impurity K (CAS CATO-C4X-202411)
- Emtricitabine Impurity N1 (CAS 143790-05-0)
- Aztreonam impurity 78 (CAS CATO-C4X-152278)
- 1-Phenyl-3-(o-tolyl)-1h-pyrazol-5-amine (CAS 618092-66-3)
- 2-(4-(Difluoromethyl)-6-methoxy-3-nitropyridin-2-yl)acetonitrile (CAS 1806988-97-5)
- Cobalt(II) oxide (CAS 1307-96-6)
- N-Methyl-1-(pyrrolidin-2-yl)methanamine dihydrochloride (CAS 2138133-16-9)
- 1-Piperidinecarboxylic acid, 4-(5-phenyl-1H-pyrazol-3-yl)-, 1,1-dimethylethyl ester (CAS 1205637-26-8)
- 4-Bromo-2-methyl-5-phenyl-3-furoic acid (CAS 2090877-55-5)
- Semaglutide impurity 206 (CAS CATO-C4X-2226206)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
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