Sildenafil Impurity 293 CAS CATO-C4X-1128293
| CAS No. | CATO-C4X-1128293 |
| Molecular Formula | C22H30N6O4S |
| Molecular Weight | 474.58 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 474.58 g/mol gives Sildenafil Impurity 293 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
As a process- or degradation-related impurity, Sildenafil Impurity 293 (CAS CATO-C4X-1128293, C22H30N6O4S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Structurally, Sildenafil Impurity 293 (C22H30N6O4S) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 11.0, corresponding to approximately 11 ring(s) or double-bond equivalent(s). With a molecular weight of 474.58 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
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 | C22H30N6O4S |
| Molecular Weight | 474.58 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 6 |
| Sulfur Atoms | 1 |
Related Sildenafil Standards
- Sildenafil Impurity 97 (CAS CATO-C4X-112897)
- Sildenafil (CAS 139755-83-2)
- Iso Sildenafil (CAS 253178-46-0)
- Sildenafil Impurity 75 (CAS 804518-64-7)
- Sildenafil Impurity 289 (CAS CATO-C4X-1128289)
- Sildenafil EP Impurity F-d8 (N-Desmethyl Sildenafil-d8) (CAS 1185168-06-2)
- Sildenafil Impurity 288 (CAS CATO-C4X-1128288)
- Sildenafil-d8 (CAS 951385-68-5)
Recommended Standards
- N-Desethyl-N-Methyl Vardenafil (CAS 224785-87-9)
- CAS 2562360-05-6 (CAS 2562360-05-6)
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- Morinidazole Impurity 19 (CAS CATO-C4X-219619)
- Cloxacillin Impurity 25 (CAS CATO-C4X-159725)
- Ticagrelor EP Impurity A (CAS 1251765-07-7)
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- 5-(5-Methyl-1,3,4-thiadiazol-2-yl)pyridin-2-amine (CAS 1177269-10-1)
- 1-(2,4-Dimethyl-phenyl)-5-oxo-pyrrolidine-3-carboxylic acid 1-(2,4-dimethylphenyl)-5-oxopyrrolidine-3-carboxylic acid 133748-22-8 (CAS 133748-22-8)
- D-[Thr]7-Liraglutide (CAS CATO-C4X-199237)
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