1-(2-(9-Bromo-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-4-(4-hydroxy-3-methoxybenzylidene)-3-methyl-1H-pyrazol-5(4H)-one CAS 119457-28-2
| CAS No. | 119457-28-2 |
| Molecular Formula | C28H20BrN5O4 |
| Molecular Weight | 570.39 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 570.39 g/mol gives 1-(2-(9-Bromo-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-4-(4-hydroxy-3-methoxybenzylidene)-3-methyl-1H-pyrazol-5(4H)-one distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
1-(2-(9-Bromo-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-4-(4-hydroxy-3-methoxybenzylidene)-3-methyl-1H-pyrazol-5(4H)-one (CAS 119457-28-2), molecular formula C28H20BrN5O4 and molecular weight 570.39 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, bromine substitution, 1-(2-(9-Bromo-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-4-(4-hydroxy-3-methoxybenzylidene)-3-methyl-1H-pyrazol-5(4H)-one is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 570.39 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.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C28H20BrN5O4 |
| Molecular Weight | 570.39 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 21.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1991 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 5 |
Related Bromo Standards
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- 2-Bromo-9,9-bis(6-bromohexyl)-9H-fluorene (CAS 438201-29-7)
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Recommended Standards
- Rebeccamycin (CAS 93908-02-2)
- (Benzenethiolato)(triphenylphosphine)gold (CAS 14243-58-4)
- N,N-(Dithiodi-2,1-ethanediyl)bis[2,5-dichloro-benzenesulfonamide (CAS 927822-86-4)
- 4H-1-Benzopyran-4-one,8-[5-(5,7-dihydroxy-4-oxo-4H-1-benzopyran-3-yl)-2,3-dihydroxyphenyl]-2-(3,4-dihydroxyphenyl)-5,7-dihydroxy- (CAS 111200-23-8)
- tert-Butyl (2-(hydroxymethyl)-3-methylbutyl)carbamate (CAS 1696524-36-3)
- 4-Cyano-2-(difluoromethyl)-5-hydroxy-3-methylpyridine (CAS 1805356-46-0)
- (4,4-Difluorocyclohexyl)benzene (CAS 161553-79-3)
- Daptomycin Impurity 13 (CAS CATO-C4X-137813)
- 3-Methyl-N-phenylbut-2-enamide (CAS 13209-80-8)
- 2,5-Dichloro-3-nitrobenzodifluoride (CAS 1806289-41-7)
- Ethyl 1-methyl-5-nitro-1H-pyrrole-2-carboxylate (CAS 1872-41-9)
- Trimethobenzamide (CAS 138-56-7)
- n-(Benzofuran-2-ylmethyl)ethanamine (CAS 74377-47-2)
- Semaglutide Impurity 147 (CAS CATO-C4X-2226147)
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