Silodosin Impurity 3 CAS CATO-C4X-17543
| CAS No. | CATO-C4X-17543 |
| Molecular Formula | C31H39F3N3O10 |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Silodosin Impurity 3 (CAS CATO-C4X-17543) is a certified pharmaceutical impurity reference standard with the molecular formula C31H39F3N3O10Li and a molecular weight of 677.60 g/mol.
Silodosin Impurity 3 (C31H39F3N3O10Li) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
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 | C31H39F3N3O10 Li |
| Molecular Weight | 677.60 g/mol |
| Purity | >90% |
| 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) | 12.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | F-containing |
| Nitrogen Atoms | 3 |
Related Silodosin Standards
- Silodosin-d6 (CAS 1051374-52-7)
- Silodosin Impurity 25 (CAS 1096141-53-5)
- Silodosin S-amine Isomer (CAS 1201180-97-3)
- Silodosin Impurity 29 (CAS 1251924-67-0)
- Silodosin-d6 DiHCl (CAS 1261392-62-4)
- Silodosin impurity N1 (CAS 1338365-54-0)
- Silodosin Carboxylic Acid Impurity (CAS 1357252-79-9)
- Silodosin Impurity 20 (CAS 1375180-28-1)
Recommended Standards
- Hydroxychloroquine Impurity 45 (CAS CATO-C4X-183545)
- Carfilzomib Impurity 61 (CAS 2049025-67-2)
- Upadacitinib Impurity 112 (CAS CATO-C4X-2405112)
- (1S)-2,2',3,3'-Tetrahydro-4,4'-diiodo-1,1'-spirobi[1H-indene]-7,7'-diol (CAS 833455-22-4)
- 1-Cbz-N,N-dimethylpiperidine-3-carboxamide (CAS 2006277-71-8)
- 2-Oxo-N-phenyloxazolidine-3-sulfonamide (CAS 87708-16-5)
- Triacetyl- β-cyclodextrin (CAS 23739-88-0)
- 2-{[(3,4-dichlorophenyl)methyl]sulfanyl}-4-methyl-6-phenylpyridine-3-carbonitrile (CAS 341967-45-1)
- 1,2,4,8-Tetrachlorodibenzofuran (CAS 64126-87-0)
- Insulin Degludec Impurity 10 (CAS CATO-C4X-215710)
Why CATO?
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