Vilanterol Impurity 88 CAS 1582675-85-1
| CAS No. | 1582675-85-1 |
| Molecular Formula | C26H37Cl2NO5 |
| Molecular Weight | 514.48 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Vilanterol Impurity 88 (CAS 1582675-85-1) is a certified pharmaceutical impurity reference standard with the molecular formula C26H37Cl2NO5 and a molecular weight of 514.48 g/mol.
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, Vilanterol Impurity 88 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 514.48 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.
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 | C26H37Cl2NO5 |
| Molecular Weight | 514.48 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1993 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
Related Vilanterol Standards
- Vilanterol Impurity 12 (CAS CATO-C4X-193512)
- Vilanterol Impurity 83 (CAS CATO-C4X-193583)
- Vilanterol Impurity 92 (CAS CATO-C4X-193592)
- Vilanterol Impurity 32 (CAS CATO-C4X-193532)
- Vilanterol Impurity C05 (CAS 503068-37-9)
- Vilanterol Impurity 48 (CAS CATO-C4X-193548)
- Vilanterol Impurity 22 (CAS CATO-C4X-193522)
- Vilanterol (CAS 503068-34-6)
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