478261-27-7 9L-327S [(3Z)-2-oxo-1-phenyl-2,3-dihydro-1H-indol-3-ylidene]amino 3-chlorobenzoate CAS 478261-27-7
| CAS No. | 478261-27-7 |
| Molecular Formula | C21H13ClN2O3 |
| Molecular Weight | 376.79 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 478261-27-7 9L-327S [(3Z)-2-oxo-1-phenyl-2,3-dihydro-1H-indol-3-ylidene]amino 3-chlorobenzoate is closely related to a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies 478261-27-7 9L-327S [(3Z)-2-oxo-1-phenyl-2,3-dihydro-1H-indol-3-ylidene]amino 3-chlorobenzoate (CAS 478261-27-7), a certified reference material (molecular formula C21H13ClN2O3, MW 376.79 g/mol) for analytical method development and quality control.
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, 478261-27-7 9L-327S [(3Z)-2-oxo-1-phenyl-2,3-dihydro-1H-indol-3-ylidene]amino 3-chlorobenzoate is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 376.79 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 | C21H13ClN2O3 |
| Molecular Weight | 376.79 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°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) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Recommended Standards
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- Semaglutide Impurity 186 (CAS CATO-C4X-2226186)
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