Budesonide Impurity 49 CAS 90039-93-3
| CAS No. | 90039-93-3 |
| Molecular Formula | C21H24O3 |
| Molecular Weight | 324.41 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Budesonide Impurity 49 (C21H24O3) contains a steroid core, a hydroxyl group, an ether linkage. 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. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
Budesonide Impurity 49 (CAS 90039-93-3) is a certified pharmaceutical impurity reference standard with the molecular formula C21H24O3 and a molecular weight of 324.41 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.
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 | C21H24O3 |
| Molecular Weight | 324.41 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| 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 |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
Related Budesonide Standards
- Budesonide Impurity 63 (CAS CATO-C4X-138963)
- Budesonide Impurity N60 (CAS 910299-74-0)
- Budesonide related compound 3 (CAS 1174448-05-5)
- Budesonide Impurity 64 (CAS 69155-84-6)
- Budesonide Impurity 70 (CAS CATO-C4X-138970)
- Budesonide Impurity 58 (CAS CATO-C4X-138958)
- Budesonide Impurity 15 (CAS CATO-C4X-138915)
- Budesonide Impurity 18 (CAS CATO-C4X-138918)
Recommended Standards
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- 933829-46-0 3-[(2-Cyclohexylphenoxy)methyl]-4-methoxybenzaldehyde MFCD03030333 (CAS 933829-46-0)
- 3-(Tert-butyl)-2-hexanoylindeno[1,2-c]pyrazol-4(2H)-one (CAS 1024132-03-3)
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- 7-(Trifluoromethyl)chroman-3-one (CAS 944899-54-1)
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- Methyl 5-bromo-2-hydroxypyrimidine-4-carboxylate (CAS 71933-03-4)
- 2-({[2-(Ethylthio)-3-pyridyl]carbonyl}-amino)-4-(methylthio)butanoic acid (CAS 175201-66-8)
- 1-(4-Pyridinylmethyl)-1,4-diazepane (CAS 199938-13-1)
- 3-(Cyclopentyloxy)aniline hydrochloride (CAS 1171382-53-8)
- Acetyl-Tau Peptide (244-274) (Repeat 1 Domain) trifluoroacetate salt (CAS 2022956-56-3)
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