Darifenacin Impurity 4 CAS CATO-C4X-16054
| CAS No. | CATO-C4X-16054 |
| Molecular Formula | C18H17N3O |
| Molecular Weight | 291.35 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Darifenacin Impurity 4 (C18H17N3O) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 12.0, corresponding to approximately 12 ring(s) or double-bond equivalent(s). With a molecular weight of 291.35 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Darifenacin Impurity 4 (CAS CATO-C4X-16054) is a certified pharmaceutical impurity reference standard with the molecular formula C18H17N3O and a molecular weight of 291.35 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 | C18H17N3O |
| Molecular Weight | 291.35 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 3 |
Related Darifenacin Standards
- Darifenacin(acetic Acid) Des-(5-Ethyl-2,3-dihydrobenzofuran) (Darifenacin Impurity) (CAS 1050646-75-7)
- Darifenacin Pyrrolidine Impurity Racemate (CAS 103887-32-7)
- Darifenacin Impurity 3 (CAS CATO-C4X-16053)
- Darifenacin Impurity 5 (CAS CATO-C4X-16055)
- Darifenacin Morpholine Amide Impurity (CAS 97483-11-9)
- Darifenacin KSM-II B(1-tosyl-(3S)-hydrox (CAS 133034-00-1)
- Darifenacin USP Related Compound G (CAS 127264-14-6)
- Darifenacin 7-Bromoethyl Impurity (CAS 1598271-92-1)
Recommended Standards
- Gefitinib Impurity 56 (CAS 675126-27-9)
- 6-Chloro-1-(4-chlorobenzyl)-1H-indazol-3(2H)-one (CAS 103427-60-7)
- Linagliptin Impurity 55 (CAS CATO-C4X-110155)
- 1-(4-Methoxybenzyl)-1,2-dihydro-3H-indazol-3-one (CAS 103427-61-8)
- Atogepant Impurity 88 (CAS CATO-C4X-328588)
- Salbutamol Impurity 84 (CAS CATO-C4X-117684)
- Bevantolol Impurity 36 (CAS 762182-55-8)
- Bis(2-((tert-butyldiphenylsilyl)oxy)ethyl)amine (CAS 189279-33-2)
- 4-Methylpentanenitrile (CAS 542-54-1)
- 2-Bromo-4-fluorobenzo[d]oxazole (CAS 1508066-38-3)
- Ethyl 4-(2-aminoethyl)-1h-pyrrole-2-carboxylate (CAS 1265965-09-0)
- Methyl 4-ethyl-5-imino-3-methyl-2,5-dihydro-1H-pyrazole-1-carbodithioate (CAS 342411-69-2)
- 2-Fluoro-4-(3-methylbutoxy)aniline (CAS 1306968-31-9)
- Semaglutide impurity 290 (CAS CATO-C4X-2226290)
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