Levonorgestrel EP Impurity W CAS 155683-59-3
| CAS No. | 155683-59-3 |
| Molecular Formula | C21H24O2 |
| Molecular Weight | 308.41 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Levonorgestrel EP Impurity W (CAS 155683-59-3), a pharmacopoeial impurity reference standard (molecular formula C21H24O2, MW 308.41 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Levonorgestrel EP Impurity W (C21H24O2) contains a steroid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 10.0, corresponding to approximately 10 ring(s) or double-bond equivalent(s). With a molecular weight of 308.41 g/mol, it falls into the moderately-high-molecular-weight range. 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.
As a certified reference material (CRM), Levonorgestrel EP Impurity W 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 | C21H24O2 |
| Molecular Weight | 308.41 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >90% |
| Storage | Store at 2-8°C, protect from light |
| 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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2001 |
Related Levonorgestrel Standards
- Levonorgestrel Impurity 33 (CAS 93798-38-0)
- Levonorgestrel EP Impurity A (CAS 1260525-53-8)
- Levonorgestrel EP Impurity M (CAS 51087-61-7)
- Levonorgestrel Impurity 2 (CAS 850-92-0)
- Levonorgestrel Impurity 42 (CAS 62298-52-6)
- Levonorgestrel EP Impurity P (CAS 10021-05-4)
- Levonorgestrel EP Impurity P (CAS 100021-05-4)
- Levonorgestrel EP Impurity B (CAS 19914-67-1)
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Why CATO?
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