Vilanterol Impurity 40 CAS 503070-57-3
| CAS No. | 503070-57-3 |
| Molecular Formula | C15H21BrCl2O2 |
| Molecular Weight | 384.14 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.
CATO supplies Vilanterol Impurity 40 (CAS 503070-57-3), a pharmacopoeial impurity reference standard (molecular formula C15H21BrCl2O2, MW 384.14 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Vilanterol Impurity 40 (C15H21BrCl2O2) contains a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine/bromine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 384.14 g/mol, it falls into the moderately-high-molecular-weight range. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
Physical & Chemical Properties
| Molecular Formula | C15H21BrCl2O2 |
| Molecular Weight | 384.14 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| 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 |
| CAS Registry Year (est.) | 1984 |
| Halogen Content | Cl/Br-containing |
Related Vilanterol Standards
- Vilanterol Impurity 13 (CAS CATO-C4X-193513)
- Vilanterol Impurity 14 (CAS CATO-C4X-193514)
- 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)
- Vilanterol Impurity 33 (CAS CATO-C4X-193533)
- Vilanterol Impurity 34 (CAS 503070-64-2)
Recommended Standards
- 4,5-Dibromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole-2-carbaldehyde (CAS 1329166-99-5)
- Carfentrazone (free acid) (CAS 128621-72-7)
- Alectinib Impurity 66 (CAS CATO-C4X-283666)
- 5-(Tributylstannyl)pyrazin-2-amine (CAS 446285-55-8)
- N-Nitroso Tolterodine EP Impurity E (CAS 2680528-95-2)
- Probucol Impurity 13 (CAS 40084-31-9)
- Empagliflozin impurity 56 (CAS 1628918-33-1)
- tert-butyl (3-methoxypropyl)carbamate (CAS 911300-60-2)
- N-isopropyl-N-(3-methoxybenzyl)glycine (CAS 1178924-09-8)
- 7-(3-Chlorophenyl)-3-(4-fluorobenzyl)thieno[3,2-d]pyrimidin-4(3H)-one (CAS 1105238-55-8)
- 2’,3’-Dimethoxyacetophenone (CAS 38480-94-3)
- 4-(2-(Methylthio)pyrimidin-4-yl)aniline (CAS 1355334-92-7)
- Cabotegravir Impurity 11 (CAS 1646862-08-9)
- Tirzepatide Impurity 22 X TFA Salt (CAS CATO-C4X-324022)
Why CATO?
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