Terazosin Impurity 4 CAS 20197-86-8
| CAS No. | 20197-86-8 |
| Molecular Formula | C10H9ClN2O3 |
| Molecular Weight | 240.64 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Terazosin Impurity 4 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.
Terazosin Impurity 4 (CAS 20197-86-8), molecular formula C10H9ClN2O3 and molecular weight 240.64 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C10H9ClN2O3, Terazosin Impurity 4 contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 240.64 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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.
Physical & Chemical Properties
| Molecular Formula | C10H9ClN2O3 |
| Molecular Weight | 240.64 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Terazosin Standards
- Terazosin Impurity 18 (CAS CATO-C4X-134918)
- Terazosin Impurity 33 (CAS 2470438-57-2)
- Terazosin EP Impurity M (CAS 31350-27-3)
- Terazosin EP Impurity O (CAS 547730-06-3)
- Terazosin Hydrochloride Dihydrate EP Impurity O (CAS CATO-C4X-134929)
- Terazosin RC 2 (CAS 113534-03-5)
- Terazosin EP Impurity N (CAS 63074-07-7)
- Terazosin Hydrochloride Dihydrate EP Impurity N (CAS 412334-56-6)
Recommended Standards
- n-Allyl-2-chloro-4-nitrobenzamide (CAS 304887-50-1)
- n-(2-Chloro-5-nitrophenyl)cyclopropanecarboxamide (CAS 321532-92-7)
- Ethyl 6-Chloroimidazo[1,2-b]pyridazin-2-ylcarbamate (CAS 1005785-65-8)
- Methyl 6-chloro-5-methoxy-1H-indazole-3-carboxylate (CAS 2105219-60-9)
- Ethyl 2,2,2-trichloroacetimidate (CAS 23213-96-9)
- Methyl 2-bromo-4-hydroxypyridine-3-carboxylate (CAS 217812-02-7)
- 3-(Cyanomethyl)-1-phenyl-5-(1H-pyrrol-1-yl)-1H-pyrazole-4-carbonitrile (CAS 217462-07-2)
- 2-Fluoro-4-(pentafluoro-lambda6-sulfanyl)aniline (CAS 1240257-25-3)
- 2-{4-[(2-cyanopyridin-4-yl)oxy]phenyl}acetic acid (CAS 1423029-71-3)
- 39257-33-5 Tricyclo[3.3.1.13,7]dec-1-ene (CAS 39257-33-5)
- (2R,3R)-Methyl 2,3-dihydroxybutanoate (CAS 112709-73-6)
- 3-(Furan-3-yl)-N-((1-(methylsulfonyl)piperidin-4-yl)methyl)acrylamide (CAS 1798402-09-1)
- Tolperisone Impurity 5 (CAS 756433-31-5)
- Semaglutide impurity 42 (CAS CATO-C4X-222642)
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