2,4-Dibromo-17,17-ethylenedioxy-1,3,5(10)-estratriene-3,16a-diol CAS 90474-20-7
| CAS No. | 90474-20-7 |
| Molecular Formula | C20H24Br2O4 |
| Molecular Weight | 488.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
2,4-Dibromo-17,17-ethylenedioxy-1,3,5(10)-estratriene-3,16a-diol (CAS 90474-20-7), molecular formula C20H24Br2O4 and molecular weight 488.21 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a flavonoid core, a hydroxyl group, an ether linkage, bromine substitution, 2,4-Dibromo-17,17-ethylenedioxy-1,3,5(10)-estratriene-3,16a-diol is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 488.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
As a certified reference material (CRM), 2,4-Dibromo-17,17-ethylenedioxy-1,3,5(10)-estratriene-3,16a-diol meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C20H24Br2O4 |
| Molecular Weight | 488.21 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
| Halogen Content | Br-containing |
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Recommended Standards
- (E)-N-{[3-chloro-5-(trifluoromethyl)pyridin-2-yl]({4-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl})methylidene}hydroxylamine (CAS 320420-34-6)
- 1,4-Bis(4-bromophenoxy)-2,5-dimethylhexane-2,5-diol (CAS 186498-09-9)
- Cariprazine Impurity 69 (CAS CATO-C4X-240869)
- 2,3,3',4,4',5,5',6,6',7,7',8,8'-Tridecafluoro-1,1'-binaphthalene (CAS 89883-28-3)
- Norethindrone (CAS 68-22-4)
- (6-Bromopyridin-3-yl)(4-methylpiperazin-1-yl)methanone (CAS 866465-78-3)
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- 4-Ethylcyclohexan-1-amine (CAS 42195-97-1)
- 3-methyl-2-(pyridin-3-yl)butan-1-amine (CAS 1368841-25-1)
- 25N-NBOMe hydrochloride (CAS 1566571-65-0)
- 5-Amino-3-(3-hydroxypropoxy)-1h-pyrazole-4-carbonitrile (CAS 892143-04-3)
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- 1,1,1,3,3,3-Hexafluoro-2-(4-methyl-3-nitrophenyl)propan-2-ol (CAS 35445-56-8)
- Liraglutide Sodium Salt (CAS 204656-20-2（free base）)
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