Vardenafil Impurity 44 CAS CATO-C4X-101744
| CAS No. | CATO-C4X-101744 |
| Molecular Formula | C21H27BrN6O4S |
| Molecular Weight | 539.45 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The molecular framework of Vardenafil Impurity 44 (C21H27BrN6O4S) is characterized by a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, bromine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
Vardenafil Impurity 44 (CAS CATO-C4X-101744) is a certified pharmaceutical impurity reference standard with the molecular formula C21H27BrN6O4S and a molecular weight of 539.45 g/mol.
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.
As a certified reference material (CRM), Vardenafil Impurity 44 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.
Physical & Chemical Properties
| Molecular Formula | C21H27BrN6O4S |
| Molecular Weight | 539.45 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 6 |
| Sulfur Atoms | 1 |
Related Vardenafil Standards
- Vardenafil Impurity 65 (CAS 224788-55-0)
- Vardenafil Impurity 37 (CAS CATO-C4X-101737)
- Vardenafil Impurity 30 (CAS 1339092-18-0)
- Vardenafil Nitroso Impurity 27 (CAS CATO-C4X-101727)
- Vardenafil Impurity 61 (CAS 933796-16-8)
- Vardenafil Impurity 33 (CAS CATO-C4X-101733)
- Vardenafil Impurity N1 (CAS 448184-56-3)
- Vardenafil Impurity 3 (CAS 224785-98-2)
Recommended Standards
- Ethyl 2-((5-(2,5-dichlorophenyl)furan-2-yl)methylene)-7-methyl-3-oxo-5-phenyl-3,5-dihydro-2H-thiazolo[3,2-a]pyrimidine-6-carboxylate (CAS 324566-50-9)
- 2-(3-Bromophenyl)-2',6,6'-triphenyl-4,4'-bipyridine (CAS 1956340-64-9)
- (E)-Ethyl 3-(2-ethoxy-5-nitrophenyl)-2,2-difluoro-3-(2-((2-(trifluoromethyl)phenyl)sulfonyl)hydrazono)propanoate (CAS 2738683-72-0)
- Triamcinolone Acetonide Impurity 47 (CAS 25092-29-9)
- Revefenacin Impurity N11 (CAS 938143-02-3)
- Cobicistat impurity 6 (CAS 1370406-84-0)
- riptorelin Impurity 21 ·xTFA salt (CAS CATO-C4X-186222)
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- Perfluorophenyl 3-(1,3-dioxolan-2-yl)thiophene-2-carboxylate (CAS 910037-02-4)
- 4-(3,4-dimethoxyphenyl)-6-methyl-isoxazolo[5,4-b]pyridin-3-amine (CAS 1225971-53-8)
- 2-Amino-2-(4-(trifluoromethyl)phenyl)acetamide (CAS 203065-99-0)
- 4-(2-aminoethyl)-1-phenylpiperidin-4-ol (CAS 1695847-51-8)
- 4-Pentylcyclohexanol (CAS 54410-90-1)
- [Ser39-OH] Tirzepatide (CAS CATO-C4X-324041)
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