Ensifentrine Impurity 3 CAS 3067475-18-4
| CAS No. | 3067475-18-4 |
| Molecular Formula | C25H29N5O4 |
| Molecular Weight | 463.53 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C25H29N5O4, Ensifentrine Impurity 3 contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 463.53 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
Ensifentrine Impurity 3 (CAS 3067475-18-4) is a certified pharmaceutical impurity reference standard with the molecular formula C25H29N5O4 and a molecular weight of 463.53 g/mol.
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 | C25H29N5O4 |
| Molecular Weight | 463.53 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | ≥95% |
| 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 |
| CAS Registry Year (est.) | 2005 |
| Nitrogen Atoms | 5 |
Related Ensifentrine Standards
- Ensifentrine Impurity 4 (CAS 3067475-19-5)
- Ensifentrine impurity 35 (CAS CATO-C4X-335335)
- Ensifentrine impurity 42 (CAS CATO-C4X-335342)
- 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 11 (CAS CATO-C4X-335311)
Recommended Standards
- Baricitinib Impurity 77 (CAS CATO-C4X-226077)
- Palbociclib Impurity 92 (CAS CATO-C4X-112592)
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- Palbociclib Impurity 58 (CAS 2231085-26-8)
- Prilocaine impurity 42 (CAS CATO-C4X-193442)
- Roxithromycin impurity 27 (CAS CATO-C4X-130327)
- Timolol EP Impurity E (CAS 1026075-53-5)
- Clindamycin Impurity 164 (CAS 1123211-65-3 (free base))
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- Tert-butyl (2-hydroxy-2-phenylethyl)(methyl)carbamate (CAS 77184-09-9)
- Characteristic MSH-Tetrapeptide (CAS 4289-02-5)
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