Estriol Impurity 11 CAS 690996-27-1
| CAS No. | 690996-27-1 |
| Molecular Formula | C27H31BrO3 |
| Molecular Weight | 483.44 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 483.44 g/mol gives Estriol Impurity 11 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies Estriol Impurity 11 (CAS 690996-27-1), a pharmacopoeial impurity reference standard (molecular formula C27H31BrO3, MW 483.44 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C27H31BrO3, Estriol Impurity 11 contains a steroid core, a hydroxyl group, an ether linkage, bromine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 483.44 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.
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 Estriol Impurity 11 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 | C27H31BrO3 |
| Molecular Weight | 483.44 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Halogen Content | Br-containing |
Related Estriol Standards
- Estriol 16-Glucuronide (CAS 1852-50-2)
- Estriol Impurity 27 (CAS 7219-89-8)
- Estriol impurity 25 (CAS 55105-93-6)
- Estriol Impurity 13 (CAS CATO-C4X-163713)
- Estriol Impurity 15 (CAS CATO-C4X-163715)
- Estriol Triacetate (CAS 2284-32-4)
- Estriol Impurity 26 (CAS CATO-C4X-163726)
- Estriol impurity 24 (CAS 104202-84-8)
Recommended Standards
- Methotrexate impurity 53 (CAS CATO-C4X-115453)
- Ethyl 4-methoxy-3-[(E)-N'-{2-[3-(trifluoromethyl)phenoxy]ethoxy}imidamido]thieno[2,3-b]pyridine-2-carboxylate (CAS 341966-72-1)
- Methotrexate impurity 50 (CAS CATO-C4X-115450)
- Acarbose EP Impurity D (CAS 68128-53-0)
- Leuprorelin EP Impurity D 2*Trifluoroacetic acid (CAS 1926163-25-8 (free base))
- Sulbactam Impurity 41 (CAS CATO-C4X-175641)
- Perindopril Impurity 64 t-Butylamine (CAS 145513-50-4 (free acid))
- 5-Bromo-4-chloro-2-(methylsulfonyl)pyrimidine (CAS 79091-24-0)
- 1-(4-butoxyphenyl)ethanone (CAS 5736-89-0)
- 2,3-Dihydro-1H-indol-5-amine (CAS 15918-80-6)
- 2-(3-Fluorophenyl)-1,3,2-dioxaborinane (CAS 684648-38-2)
- 2-Boc-1,1-dimethyl-1,2,3,4-tetrahydroisoquinolin-6-ol (CAS 1638765-20-4)
- (trans,trans)-4-Pentylphenyl 4'-propyl-[1,1'-bi(cyclohexane)]-4-carboxylate (CAS 84078-44-4)
- Glucagon-like peptide 2 (CAS 89750-15-2)
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