Ulipristal Impurity 4 CAS 244206-52-8
| CAS No. | 244206-52-8 |
| Molecular Formula | C26H31NO3 |
| Molecular Weight | 405.53 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 405.53 g/mol gives Ulipristal Impurity 4 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Ulipristal Impurity 4 (CAS 244206-52-8) is a certified pharmaceutical impurity reference standard with the molecular formula C26H31NO3 and a molecular weight of 405.53 g/mol.
The molecular framework of Ulipristal Impurity 4 (C26H31NO3) is characterized by a steroid core, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
CATO manufactures Ulipristal Impurity 4 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C26H31NO3 |
| Molecular Weight | 405.53 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Nitrogen Atoms | 1 |
Related Ulipristal Standards
- Ulipristal Impurity 27 (CAS 1655514-79-6)
- Ulipristal Impurity 31 (CAS 54201-84-2)
- Ulipristal Impurity 9 (CAS CATO-C4X-19159)
- Ulipristal Impurity 13 (CAS CATO-C4X-191513)
- Ulipristal Impurity 12 (CAS CATO-C4X-191512)
- Ulipristal Impurity 1 (CAS 159681-67-1)
- Ulipristal Impurity 16 (CAS 159811-51-5)
- Ulipristal D3 (CAS CATO-C4X-191535)
Recommended Standards
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Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com