Vardenafil Impurity 16 CAS CATO-C4X-101716
| CAS No. | CATO-C4X-101716 |
| Molecular Formula | C20H26N4O5S |
| Molecular Weight | 434.51 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
CATO supplies Vardenafil Impurity 16 (CAS CATO-C4X-101716), a pharmacopoeial impurity reference standard (molecular formula C20H26N4O5S, MW 434.51 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C20H26N4O5S, Vardenafil Impurity 16 contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 434.51 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C20H26N4O5S |
| Molecular Weight | 434.51 g/mol |
| Purity | >95% |
| 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 |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Vardenafil Standards
- Vardenafil Impurity 32 (CAS CATO-C4X-101732)
- Vardenafil Impurity 26 (CAS CATO-C4X-101726)
- Vardenafil Impurity 57 (CAS CATO-C4X-101757)
- Vardenafil Impurity 48 (CAS 224785-72-2)
- Vardenafil Impurity 64 (CAS 224786-03-2)
- Vardenafil Impurity 14 (CAS CATO-C4X-101714)
- Vardenafil Impurity N2 (CAS 448184-54-1)
- Vardenafil Impurity 29 (CAS 1009013-42-6)
Recommended Standards
- 893767-65-2 1,3,6-Trimethyl-2-oxo-N-{3-[(E)-2-pyridin-4-ylvinyl]phenyl}-2,3-dihydro-1H-benzimidazole-5-sulfonamide MFCD07658583 (CAS 893767-65-2)
- Z-LYs(tos)-oh dcha (CAS 2362-45-0)
- Sildenafil Impurity 281 (CAS CATO-C4X-1128281)
- SPDMV-sulfo (CAS 2101206-86-2)
- Oseltamivir Impurity 172 (CAS CATO-C4X-1720172)
- Indacaterol Impurity 56 HCl (CAS CATO-C4X-150056)
- Isavuconazole Impurity 69 (CAS CATO-C4X-123669)
- 3-Amino-6-(difluoromethyl)-4-(p-tolyl)thieno[2,3-b]pyridine-2-carboxamide (CAS 832737-16-3)
- 3-(4-Hydroxypyridin-2-yl)benzaldehyde (CAS 1261909-98-1)
- 1-(((4-Methylbenzyl)amino)methyl)cyclopentan-1-ol (CAS 1484104-66-6)
- (3'-Chloro-5'-hydroxy-[1,1'-biphenyl]-2-yl)(pyrrolidin-3-yl)methanone (CAS 1261897-37-3)
- Vildagliptin Impurity 7 (CAS 22947-51-9)
- 2-(Pyridin-3-yl)-1,3-thiazole-5-carbaldehyde (CAS 882032-77-1)
- 98035-79-1 Small cardioactive peptide A L-Methioninamide, L-alanyl-L-arginyl-L-prolylglycyl-L-tyrosyl-L-leucyl-L-alanyl-L-phenylalanyl-L-prolyl-L-arginyl- SCPA (CAS 98035-79-1)
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