Vilanterol Impurity 33 CAS CATO-C4X-193533
| CAS No. | CATO-C4X-193533 |
| Molecular Formula | C16H23BrCl2O2 |
| Molecular Weight | 398.16 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
As a process- or degradation-related impurity, Vilanterol Impurity 33 (CAS CATO-C4X-193533, C16H23BrCl2O2) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Vilanterol Impurity 33 (C16H23BrCl2O2) contains a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine/bromine substitution, an aromatic ring system. Halogen substitution raises its density and boiling point, its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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.
Physical & Chemical Properties
| Molecular Formula | C16H23BrCl2O2 |
| Molecular Weight | 398.16 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | >95% |
| Storage | Store at room temperature |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Cl/Br-containing |
Related Vilanterol Standards
- Vilanterol Impurity 85 (CAS CATO-C4X-193585)
- Vilanterol Impurity 13 (CAS CATO-C4X-193513)
- Vilanterol Impurity 14 (CAS CATO-C4X-193514)
- Vilanterol Impurity 40 (CAS 503070-57-3)
- Vilanterol Impurity 6 (CAS CATO-C4X-19356)
- Vilanterol Impurity 7 (CAS CATO-C4X-19357)
- Vilanterol Impurity 67 (CAS CATO-C4X-193567)
- Vilanterol Impurity 91 (CAS CATO-C4X-193591)
Recommended Standards
- Methyl 2-chloro-3-(2-chloro-5-(4-(difluoromethyl)-3-methyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl)-4-fluorophenyl)propanoate (CAS 128621-71-6)
- 4-Bromo-N-(4-fluoro-3-(trifluoromethyl)phenyl)benzenesulfonamide (CAS 1022050-36-7)
- Perfluorobutane-1,4-diyl bis(sulfurofluoridate) (CAS 78522-71-1)
- 3-Methoxy-5-(tributylstannyl)pyridine (CAS 1204580-74-4)
- Dopamine Impurity 119 (CAS 24997-85-1)
- Vonoprazan Impurity 134 (CAS 52334-53-9)
- Chlortetracycline Hydrochloride EP Impurity L (CAS CATO-C4X-233022)
- (2S)-3,6-bis[(tert-butoxy)carbonyl]-3,6-diazabicyclo[3.1.0]hexane-2-carboxylic acid (CAS 2227202-49-3)
- (5-Bromo-2-methoxybenzyl)(1-ethylpropyl)amine (CAS 418773-91-8)
- N-Acetylhistidine (CAS 2497-02-1)
- Resveratrol 3-O-sulfate (Trans) (CAS 553662-69-4)
- n-(3-Iodophenyl)-2-(phenylthio)acetamide (CAS 692286-77-4)
- 4-(5-Ethyl-1,3,4-oxadiazol-2-yl)benzaldehyde (CAS 1309875-09-9)
- Galanin-Like Peptide (human) trifluoroacetate salt (CAS 245114-99-2)
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