Ensifentrine impurity 38 CAS CATO-C4X-335338
| CAS No. | CATO-C4X-335338 |
| Molecular Formula | C26H31N5O4 |
| Molecular Weight | 477.56 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.
Ensifentrine impurity 38 (CAS CATO-C4X-335338) is a certified pharmaceutical impurity reference standard with the molecular formula C26H31N5O4 and a molecular weight of 477.56 g/mol.
Ensifentrine impurity 38 (C26H31N5O4) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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 | C26H31N5O4 |
| Molecular Weight | 477.56 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 5 |
Related Ensifentrine Standards
- Ensifentrine (CAS 1884461-72-6)
- Ensifentrine impurity 32 (CAS CATO-C4X-335332)
- Ensifentrine impurity 34 (CAS CATO-C4X-335334)
- Ensifentrine impurity 11 (CAS CATO-C4X-335311)
- Ensifentrine impurity 35 (CAS CATO-C4X-335335)
- Ensifentrine impurity 31 (CAS CATO-C4X-335331)
- Ensifentrine Impurity 3 (CAS 3067475-18-4)
- Ensifentrine Impurity 4 (CAS 3067475-19-5)
Recommended Standards
- H-Phe-Arg-Arg-OH (CAS 150398-22-4)
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- Nintedanib impurity 182 (CAS CATO-C4X-1814182)
- Fmoc-HoCys(Mob)-OH (CAS 2044710-98-5)
- Desmopressin Tyrosine Oxidation Impurity 1 (CAS CATO-C4X-221518)
- Topiroxostat Impurity 46 (CAS 29181-50-8)
- Nimodipine Impurity 7 (CAS 82219-48-5)
- (4-Ethylpyridin-2-yl)methanamine (CAS 1211592-52-7)
- 2-Cyanoethyl-N,N-diisopropylchlorophosphoramidite (CAS 89992-70-1)
- p-Bromonitrophenyl-<SUP>13</SUP>C<SUB>6</SUB> (CAS 1173022-54-2)
- Voclosporin Impurity 2 (CAS CATO-C4X-30652)
- 2-Chloro-5-hydrazinylpyrazine hydrochloride (CAS 2227272-59-3)
- 3,5-Dibromo-2-methylpyridine (CAS 38749-87-0)
- Neuropeptide VF (124-131) (human) (CAS 311309-27-0)
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