Atorvastatin Impurity 93 CAS 163217-74-1
| CAS No. | 163217-74-1 |
| Molecular Formula | C33H33FN2O5 |
| Molecular Weight | 556.62 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Atorvastatin Impurity 93 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Atorvastatin Impurity 93 (CAS 163217-74-1) is a certified pharmaceutical impurity reference standard with the molecular formula C33H33FN2O5 and a molecular weight of 556.62 g/mol.
Based on its molecular formula C33H33FN2O5, Atorvastatin Impurity 93 contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 556.62 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C33H33FN2O5 |
| Molecular Weight | 556.62 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 18.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2003 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Atorvastatin Standards
- Atorvastatin Impurity 100 (CAS CATO-C4X-1132100)
- Atorvastatin Impurity 133 (CAS CATO-C4X-1132133)
- Atorvastatin Impurity 134 (CAS CATO-C4X-1132134)
- Atorvastatin Impurity 15 (CAS 906552-19-0)
- Atorvastatin EP Impurity O (CAS 887196-30-7)
- 5-Oxo Atorvastatin (CAS 1391052-82-6)
- Atorvastatin Impurity 34 (CAS CATO-C4X-113234)
- Atorvastatin Impurity 94 (CAS 163217-70-7)
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