Ensifentrine impurity 31 CAS CATO-C4X-335331
| CAS No. | CATO-C4X-335331 |
| Molecular Formula | C26H33N5O4 |
| Molecular Weight | 479.57 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Ensifentrine impurity 31 (CAS CATO-C4X-335331) is a certified pharmaceutical impurity reference standard with the molecular formula C26H33N5O4 and a molecular weight of 479.57 g/mol.
The molecular framework of Ensifentrine impurity 31 (C26H33N5O4) is characterized by a steroid core, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
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 | C26H33N5O4 |
| Molecular Weight | 479.57 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) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 5 |
Related Ensifentrine Standards
- Ensifentrine impurity 11 (CAS CATO-C4X-335311)
- Ensifentrine (CAS 1884461-72-6)
- Ensifentrine impurity 32 (CAS CATO-C4X-335332)
- Ensifentrine impurity 34 (CAS CATO-C4X-335334)
- Ensifentrine impurity 38 (CAS CATO-C4X-335338)
- Ensifentrine impurity 35 (CAS CATO-C4X-335335)
- Ensifentrine Impurity 3 (CAS 3067475-18-4)
- Ensifentrine Impurity 4 (CAS 3067475-19-5)
Recommended Standards
- Benzyl (S)-(1-(4-benzyl-3-(benzyloxy)phenyl)-1-oxopropan-2-yl)carbamate (CAS CATO-C4X-294312)
- Imatinib EP Impurity C (CAS 404844-02-6)
- Benzyl (1-(2-benzyl-5-(benzyloxy)phenyl)-1-oxopropan-2-yl)carbamate (CAS CATO-C4X-294311)
- Rizatriptan Impurity 25 (CAS CATO-C4X-175225)
- Dopamine Impurity 66 (CAS 62978-84-1)
- Landiolol Impurity 25 (CAS CATO-C4X-262125)
- Carfilzomib Impurity 11 (CAS 247068-82-2)
- 3-(2-Bromoethyl)benzonitrile (CAS 942282-39-5)
- rel-tert-Butyl benzyl((1r,4r)-4-hydroxycyclohexyl)carbamate (CAS 422507-07-1)
- 2,2-difluorocyclopropanecarbonitrile (CAS 36597-03-2)
- 3-Chloro-1-pyridin-3-ylmethyl-1H-indazole (CAS 1017781-90-6)
- 3-(2-Phenylethyl)-2-sulfanyl-5-(thiophen-2-yl)-3h,4h-thieno[2,3-d]pyrimidin-4-one (CAS 731820-91-0)
- Trimethyl Phosphonoacetate (CAS 5927-18-4)
- Semaglutide impurity 206 (CAS CATO-C4X-2226206)
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