Conjugated Estrogens EP Impurity D CAS 4999-79-5
| CAS No. | 4999-79-5 |
| Molecular Formula | C18H23O5S |
| Molecular Weight | N/A |
| 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 D distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
As a process- or degradation-related impurity, Conjugated Estrogens EP Impurity D (CAS 4999-79-5, C18H23O5SNa) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C18H23O5SNa, Conjugated Estrogens EP Impurity D contains a flavonoid core, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 374.43 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
CATO manufactures Conjugated Estrogens EP Impurity D 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 | C18H23O5S Na |
| 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.) | 1958 |
| Sulfur Atoms | 1 |
Related Conjugated Standards
- Conjugated Linoleic Acid Methyl Ester (CAS 1002-79-5)
- Conjugated octadecadienoic acid (CAS 121250-47-3)
- Conjugated Linoleic Acid Ethyl Ester, 90% (Mixture of Isomers) (CAS 137142-61-1)
- Conjugated Estrogens EP Impurity H (CAS 16680-48-1)
- Conjugated Estrogens EP Impurity C (CAS 16680-49-2)
- Conjugated Estrogens EP Impurity F (CAS 16680-50-5)
- Conjugated Estrogens EP Impurity J (CAS 474-86-2)
- Conjugated Estrogens EP Impurity A (CAS 56050-04-5)
Recommended Standards
- Alectinib impurity 19 (CAS 1578259-67-2)
- Argatroban Impurity 79 (CAS 121785-72-6)
- Ibrutinib Impurity 97 (CAS 2256059-43-3)
- Ethyl 4-phenoxybutanoate (CAS 2364-59-2)
- 1-(3-Carboxypropyl)-5-oxopyrrolidine-3-carboxylic acid (CAS 51316-26-8)
- (3-Chloro-5-fluorophenyl)(4-chlorophenyl)methanol (CAS 844683-35-8)
- 1-((3A'R,4'R,6'R,6a'S)-6'-(fluoromethyl)-6'-(hydroxymethyl)-3a'-methyltetrahydrospiro[cyclopentane-1,2'-furo[3,4-d][1,3]dioxol]-4'-yl)pyrimidine-2,4(1H,3H)-dione (CAS 1643585-09-4)
- ethyl (2S)-2-fluoro-2-(1-naphthyl)acetate (CAS 2738339-14-3)
- 3-(Aminomethyl)-3-methyloctan-4-ol (CAS 1518405-91-8)
- Semaglutide impurity 275 (CAS CATO-C4X-2226275)
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