Cilostazol Impurity 3 CAS 73963-42-5
| CAS No. | 73963-42-5 |
| Molecular Formula | C11H19ClN4 |
| Molecular Weight | 242.75 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.
Cilostazol Impurity 3 (CAS 73963-42-5) is a certified pharmaceutical impurity reference standard with the molecular formula C11H19ClN4 and a molecular weight of 242.75 g/mol.
Cilostazol Impurity 3 (C11H19ClN4) contains a nitrogen-containing heterocyclic scaffold, a nitrile group, chlorine substitution. Halogen substitution raises its density and boiling point, its high carbon-to-hydrogen ratio confers good lipid solubility; 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 | C11H19ClN4 |
| Molecular Weight | 242.75 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1978 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related Cilostazol Standards
- Cilostazol Impurity N3 (CAS 934533-78-5)
- Cilostazol Impurity 15 (CAS CATO-C4X-132815)
- Cilostazol Impurity 20 (CAS 84996-93-0)
- Cilostazol impurity 11 (CAS 54197-64-7)
- Cilostazol USP Related Compound A (CAS 54197-66-9)
- Cilostazol Impurity 13 (CAS 22716-03-6)
- Cilostazol Impurity 8 (CAS 73963-46-9)
- Cilostazol USP Related Compound B (CAS 73963-62-9)
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- Tiotropium EP Impurity D (CAS 136310-66-2)
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