Clomifene EP Impurity A CAS 19957-52-9
| CAS No. | 19957-52-9 |
| Molecular Formula | C26H29NO |
| Molecular Weight | 371.51 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Clomifene EP Impurity A 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.
Clomifene EP Impurity A (CAS 19957-52-9) is a certified pharmaceutical impurity reference standard with the molecular formula C26H29NO and a molecular weight of 371.51 g/mol.
Structurally, Clomifene EP Impurity A (C26H29NO) 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 371.51 g/mol, it falls into the moderately-high-molecular-weight range. 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 | C26H29NO |
| Molecular Weight | 371.51 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Nitrogen Atoms | 1 |
Related Clomifene Standards
- Clomifene (CAS 911-45-5)
- Clomifene Impurity 9 (CAS 113454-71-0)
- Clomifene Impurity 18 (CAS CATO-C4X-151218)
- Clomifene Impurity 19 (CAS CATO-C4X-151219)
- Clomifene EP Impurity B (CAS 796-77-0)
- Clomifene Impurity 7 (CAS 58280-04-9)
- Clomifene Impurity 8 (CAS 23464-17-7)
- Clomifene Citrate EP Impurity D (CAS 1391054-64-0)
Recommended Standards
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- 4-Amino-2-chloropyrimidine-5-carboxamide (CAS 98027-38-4)
- Semaglutide impurity 193 (CAS CATO-C4X-2226193)
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