Etizolam Impurity C19 CAS 42753-80-0
| CAS No. | 42753-80-0 |
| Molecular Formula | C23H17ClN2O4S |
| Molecular Weight | 452.91 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Etizolam Impurity C19 (CAS 42753-80-0) is a certified pharmaceutical impurity reference standard with the molecular formula C23H17ClN2O4S and a molecular weight of 452.91 g/mol.
Based on its molecular formula C23H17ClN2O4S, Etizolam Impurity C19 contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 452.91 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO manufactures Etizolam Impurity C19 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 | C23H17ClN2O4S |
| Molecular Weight | 452.91 g/mol |
| 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) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1969 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Etizolam Standards
- Etizolam Impurity 10 (CAS CATO-C4X-350910)
- Etizolam Impurity 21 (CAS CATO-C4X-350921)
- Etizolam Impurity 16 (CAS 50508-90-2)
- Etizolam Impurity 11 (CAS CATO-C4X-350911)
- Etizolam Impurity 29 (CAS CATO-C4X-350929)
- Etizolam Impurity 33 (CAS CATO-C4X-350933)
- Etizolam Impurity 30 (CAS CATO-C4X-350930)
- Etizolam Impurity 26 (CAS CATO-C4X-350926)
Recommended Standards
- Methyl 6-amino-4-(2-chlorophenyl)-5-cyano-2-(((3-cyano-6-methylpyridin-2-yl)thio)methyl)-4H-pyran-3-carboxylate (CAS 387831-28-9)
- Rivaroxaban Impurity 206 (CAS CATO-C4X-1090206)
- 4-(Benzyloxy)phenyl 2-((5-(2-chlorophenyl)-1,3,4-oxadiazol-2-yl)thio)acetate (CAS 332126-59-7)
- (E)-2-(4-chlorobenzylidene)-7-(4-methoxyphenoxy)-3-phenyl-2,3-dihydro-1H-inden-1-one (CAS 337921-35-4)
- Empagliflozin impurity 258 (CAS CATO-C4X-1065258)
- Imrecoxib Impurity 40 (CAS CATO-C4X-237940)
- Bumetanide Impurity 108 (CAS CATO-C4X-1986108)
- 3,3-Difluoro-1-phenylpropan-1-amine (CAS 1339427-03-0)
- 2-chloro-N-[2-(1H-indol-3-yl)-2-(4-methoxyphenyl)ethyl]acetamide (CAS 924219-40-9)
- 1-Methylcyclopropanecarboximidamide (CAS 762192-22-3)
- 4-(Allyloxy)-3,5-dichlorobenzoic acid (CAS 41727-45-1)
- (3-Boc-amino-azetidin-1-yl)-thiophen-2-yl-acetic acid (CAS 885275-99-0)
- n-Methyl-2-(1,2,3,4-tetrahydronaphthalen-1-yl)ethan-1-amine (CAS 1342736-90-6)
- Semaglutide impurity 29 (CAS 1188328-22-4)
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