Deflazacort Impurity 91 CAS CATO-C4X-202191
| CAS No. | CATO-C4X-202191 |
| Molecular Formula | C9H9BrO3 |
| Molecular Weight | 245.07 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Deflazacort Impurity 91 is closely related to a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies Deflazacort Impurity 91 (CAS CATO-C4X-202191), a pharmacopoeial impurity reference standard (molecular formula C9H9BrO3, MW 245.07 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system, Deflazacort Impurity 91 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 245.07 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 certified reference material (CRM), Deflazacort Impurity 91 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 | C9H9BrO3 |
| Molecular Weight | 245.07 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | ≥95% |
| Storage | Store in a cool place (≤25°C), keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Br-containing |
Related Deflazacort Standards
- Deflazacort Impurity 90 (CAS CATO-C4X-202190)
- Deflazacort Impurity 10 (CAS CATO-C4X-233610)
- Deflazacort Impurity 7 (CAS CATO-C4X-23367)
- Deflazacort Impurity 8 (CAS CATO-C4X-23368)
- Deflazacort Impurity 9 (CAS CATO-C4X-23369)
- Deflazacort Impurity 1 (CAS 13649-57-5)
- Deflazacort Impurity 2 (CAS CATO-C4X-23362)
- Deflazacort 6a-hydroxy-21-desacetyl (CAS 87539-45-5)
Recommended Standards
- Crisaborole lmpurity 78 (CAS 2251695-12-0)
- Benzbromarone Impurity 16 (CAS 2090296-22-1)
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- Methyl 4-Bromo-2-methoxybenzoate (CAS 139102-34-4)
- Tamsulosin EP Impurity F HCl (CAS 1051368-80-9)
- Rivaroxaban EP Impurity E (CAS 1415566-28-7)
- Alectinib Impurity 53 (CAS CATO-C4X-283653)
- 3H-[1,2,3]Triazolo[4,5-D]Pyrimidin-7-Ylamine (CAS 337915-46-5)
- Bortezomib Impurity 33 (CAS 73058-37-4)
- (4-Methyl-1-piperidinyl)(2-pyrrolidinyl)methanonehydrochloride (CAS 1236267-61-0)
- 1-(2-Trifluoromethylphenyl)piperazine (CAS 63854-31-9)
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- 3-(Cyclobutylmethyl)pyrrolidine (CAS 1220021-25-9)
- (D-Trp32)-Neuropeptide Y (porcine) trifluoroacetate salt (CAS 153549-78-1)
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