Budesonide Impurity 34 CAS 1171-81-9
| CAS No. | 1171-81-9 |
| Molecular Formula | C21H30O6 |
| Molecular Weight | 378.46 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Budesonide Impurity 34 (C21H30O6) contains a flavonoid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 378.46 g/mol, it falls into the moderately-high-molecular-weight range. 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).
As a process- or degradation-related impurity, Budesonide Impurity 34 (CAS 1171-81-9, C21H30O6) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
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 | C21H30O6 |
| Molecular Weight | 378.46 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, 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 |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Budesonide Standards
- Budesonide EP Impurity A (CAS 13951-70-7)
- Budesonide Impurity 35 (CAS 3079028-41-1)
- Budesonide impurity 41 (CAS CATO-C4X-138941)
- Budesonide impurity 59 (CAS 34647-56-8)
- Budesonide Impurity 80 (CAS CATO-C4X-138980)
- Budesonide Impurity 57 (CAS CATO-C4X-138957)
- Budesonide Impurity N22 (CAS 82423-35-6)
- Budesonide Impurity 01 (CAS 1188271-73-9)
Recommended Standards
- Avibactam Impurity 142 (CAS CATO-C4X-1348142)
- Hydrocortisone EP Impurity O (CAS 154032-37-8)
- Captopril Impurity 34 (CAS CATO-C4X-119034)
- Hydrocortisone Impurity 21 (CAS 68473-77-8)
- Cefuroxime Impurity 66 (CAS CATO-C4X-124566)
- Relugolix Impurity 198 (CAS CATO-C4X-2429198)
- Paroxetine Impurity 51 (CAS CATO-C4X-103551)
- 4-(4-Chlorophenyl)butan-2-ol (CAS 76019-94-8)
- Iodomethyl Benzoate (CAS 13943-33-4)
- S-Benzylmercaptoacetyltriglycine CRS (CAS 123228-56-8)
- 4-Methoxy-3-nitrobenzothioamide (CAS 175277-84-6)
- 2-Methyl-1H-indole-4-carbonitrile (CAS 1360883-22-2)
- tert-Butyl N-[(2-chlorophenyl)methylamino]carbamate (CAS 135941-95-6)
- Semaglutide impurity 103 (CAS 1446013-07-5)
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