Finasteride Impurity 20 CAS 73671-92-8
| CAS No. | 73671-92-8 |
| Molecular Formula | C20H31NO3 |
| Molecular Weight | 333.47 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Finasteride Impurity 20 (CAS 73671-92-8, C20H31NO3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C20H31NO3, Finasteride Impurity 20 contains a steroid 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 333.47 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.
As a certified reference material (CRM), Finasteride Impurity 20 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.
Physical & Chemical Properties
| Molecular Formula | C20H31NO3 |
| Molecular Weight | 333.47 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1978 |
| Nitrogen Atoms | 1 |
Related Finasteride Standards
- Finasteride Impurity 54 (CAS 1385262-95-2)
- Finasteride Impurity N35 (CAS 7254-03-7)
- Finasteride Impurity 3-one-4-aza-5-androstene-17β-carboxylate methyl ester (CAS 104214-18-8)
- Finasteride EP Impurity B (CAS 103335-41-7)
- Finasteride Impurity 40 (CAS CATO-C4X-164540)
- Finasteride Impurity 35 (CAS CATO-C4X-164535)
- Finasteride Impurity N50 (CAS 10325-79-8)
- Finasteride Impurity 32 (CAS 51872-67-4)
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- 1,2-Dichloro-4,5-bis(trifluoromethyl)benzene (CAS 320-22-9)
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