Cyproterone Impurity 19 CAS CATO-C4X-16019
| CAS No. | CATO-C4X-16019 |
| Molecular Formula | C22H27ClO3 |
| Molecular Weight | 374.90 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Owing to a steroid core, a hydroxyl group, an ether linkage, chlorine substitution, Cyproterone Impurity 19 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 374.90 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).
Cyproterone Impurity 19 (CAS CATO-C4X-16019) is a certified pharmaceutical impurity reference standard with the molecular formula C22H27ClO3 and a molecular weight of 374.90 g/mol.
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), Cyproterone Impurity 19 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 | C22H27ClO3 |
| Molecular Weight | 374.90 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 |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Cl-containing |
Related Cyproterone Standards
- Cyproterone (CAS 2098-66-0)
- Cyproterone Acetate EP Impurity H (CAS 2668-74-8)
- Cyproterone Impurity 6 (CAS 2668-75-9)
- Cyproterone Acetate EP Impurity A (CAS 2701-50-0)
- Cyproterone Impurity 5 (CAS 30337-71-4)
- Cyproterone Impurity 8 (CAS CATO-C4X-16018)
- Cyproterone Acetate EP Impurity J (CAS 15423-97-9)
- Cyproterone Acetate EP Impurity E (CAS 17184-05-3)
Recommended Standards
- Betamethasone Impurity 27 (CAS 116846-77-6)
- Mometasone Furoate Impurity 24 (CAS CATO-C4X-170424)
- 25436-74-2 1,1,1,3,3,3-Hexaethyl-2-(triethylsilyl)trisilan-2-yl DTXSID70746448 (CAS 25436-74-2)
- tert-Butyl 2-(4-(4-chlorobenzyl)phenoxy)-2-methylbutanoate (CAS 94740-32-6)
- Clonazepam impurity 16 (CAS CATO-C4X-140316)
- Nintedanib Impurity 21 (CAS CATO-C4X-181421)
- Fluticasone Impurity 48 (CAS 397864-58-3)
- 3-(Benzyloxy)-5-nitro-1H-indazole (CAS 178160-28-6)
- Tert-butyl 5-(chlorosulfonyl)thiophene-3-carboxylate (CAS 1491206-60-0)
- Ethyl 4-formyl-1-methyl-1H-imidazole-5-carboxylate (CAS 2111324-86-6)
- ethyl 2-(3-chloropyridin-4-yl)acetate (CAS 1236306-08-3)
- 4-Bromo-1-ethyl-5-methyl-1h-pyrazol-3-amine (CAS 1006470-69-4)
- 5-Hydroxy-3-methyl-1-(p-tolyl)-1H-pyrazole-4-carbaldehyde (CAS 60484-30-2)
- Semaglutide impurity 251 (CAS CATO-C4X-2226251)
Why CATO?
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