Conjugated Estrogens EP Impurity A CAS 56050-04-5
| CAS No. | 56050-04-5 |
| Molecular Formula | C18H23NaO5S |
| Molecular Weight | 374.43 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 374.43 g/mol gives Conjugated Estrogens EP Impurity A distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
As a process- or degradation-related impurity, Conjugated Estrogens EP Impurity A (CAS 56050-04-5, C18H23NaO5S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Conjugated Estrogens EP Impurity A (C18H23NaO5S) contains a flavonoid core, a sulfone group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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.
CATO manufactures Conjugated Estrogens 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.
Physical & Chemical Properties
| Molecular Formula | C18H23NaO5S |
| Molecular Weight | 374.43 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1973 |
| Sulfur Atoms | 1 |
Related Conjugated Standards
- Conjugated Estrogens EP Impurity C (CAS 16680-49-2)
- Conjugated Estrogens EP Impurity E (CAS 56086-66-9)
- Conjugated Estrogens EP Impurity F (CAS 16680-50-5)
- Conjugated Estrogens EP Impurity G(Stabilzed with up to 40% Tromethamine) (CAS 61612-83-7)
- Conjugated Estrogens EP Impurity H (CAS 16680-48-1)
- Conjugated Estrogens Impurity 17 (CAS CATO-C4X-141617)
- Conjugated Linoleic Acid Ethyl Ester, 90% (Mixture of Isomers) (CAS 137142-61-1)
- Conjugated Linoleic Acid Methyl Ester (CAS 1002-79-5)
Recommended Standards
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- Avanafil Impurity 44 (CAS CATO-C4X-111844)
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- C-Type Natriuretic Peptide (32-53) (human, porcine, rat) (CAS 127869-51-6)
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