Estriol EP Impurity K CAS 901-93-9
| CAS No. | 901-93-9 |
| Molecular Formula | C20H24O3 |
| Molecular Weight | 312.40 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Estriol EP Impurity K 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.
As a process- or degradation-related impurity, Estriol EP Impurity K (CAS 901-93-9, C20H24O3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C20H24O3, Estriol EP Impurity K contains a steroid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 312.40 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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.
Physical & Chemical Properties
| Molecular Formula | C20H24O3 |
| Molecular Weight | 312.40 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, 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) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Estriol Standards
Recommended Standards
- Ethinylestradiol 2-Hydroxy Impurity (CAS 50394-89-3)
- N,N'-(1,4-Phenylenebis(methanylylidene))bis(3-methylaniline) (CAS 100626-96-8)
- Epoxy Exemestane (6 Alpha , Beta Isomer) (CAS 184972-12-1)
- (2,3-Dihydro-1,4-benzodioxin-6-ylmethyl)({4-[(dimethylamino)methyl]phenyl}methyl)amine (CAS 1014247-57-4)
- Canagliflozin Impurity 54 (CAS CATO-C4X-112354)
- Ciprofloxacin Impurity 16 (CAS 1391052-64-4)
- Ranitidine EP Impurity G (CAS 148639-72-9)
- 2-Cyano-3-[1-(2,5-dichlorophenyl)-2,5-dimethyl-1h-pyrrol-3-yl]prop-2-enoic acid (CAS 743440-35-9)
- Ethyl 1-(2-bromoacetyl)cyclopropanecarboxylate (CAS 129306-05-4)
- 5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,4-oxadiazole (CAS 1346808-40-9)
- 2-((3-Methylcyclohexyl)amino)cyclohexan-1-ol (CAS 1218636-26-0)
- 5-Bromopyridazin-4-ol (CAS 1784428-43-8)
- 4-(2,4-difluoroanilino)-1,1,1-trifluorobut-3-en-2-one (CAS 215654-90-3)
- Semaglutide impurity 206 (CAS CATO-C4X-2226206)
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