Ulipristal Impurity 25 CAS CATO-C4X-191525
| CAS No. | CATO-C4X-191525 |
| Molecular Formula | C30H37NO2 |
| Molecular Weight | 443.62 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.
CATO supplies Ulipristal Impurity 25 (CAS CATO-C4X-191525), a pharmacopoeial impurity reference standard (molecular formula C30H37NO2, MW 443.62 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Ulipristal Impurity 25 (C30H37NO2) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 13.0, corresponding to approximately 13 ring(s) or double-bond equivalent(s). With a molecular weight of 443.62 g/mol, it falls into the moderately-high-molecular-weight range. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 | C30H37NO2 |
| Molecular Weight | 443.62 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, 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) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
Related Ulipristal Standards
- Ulipristal Impurity 19 (CAS CATO-C4X-191519)
- Ulipristal D3 (CAS CATO-C4X-191535)
- Ulipristal Impurity 16 (CAS 159811-51-5)
- Ulipristal Impurity 3 (CAS 159681-66-0)
- Ulipristal Impurity 1 (CAS 159681-67-1)
- Ulipristal Impurity 13 (CAS CATO-C4X-191513)
- Ulipristal Impurity 21 (CAS CATO-C4X-191521)
- Ulipristal Impurity 18 (CAS CATO-C4X-191518)
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