Sildenafil Impurity 30 CAS 139755-95-6
| CAS No. | 139755-95-6 |
| Molecular Formula | C21H28N6O4S |
| Molecular Weight | 460.55 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.
As a process- or degradation-related impurity, Sildenafil Impurity 30 (CAS 139755-95-6, C21H28N6O4S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Sildenafil Impurity 30 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 460.55 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
CATO manufactures Sildenafil Impurity 30 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C21H28N6O4S |
| Molecular Weight | 460.55 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 |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1996 |
| Nitrogen Atoms | 6 |
| Sulfur Atoms | 1 |
Related Sildenafil Standards
- Sildenafil EP Impurity F (CAS 139755-82-1)
- Sildenafil Impurity 51 (CAS 263897-18-3)
- Sildenafil Impurity 303 (CAS CATO-C4X-1128303)
- Sildenafil Impurity 291 (CAS CATO-C4X-1128291)
- Sildenafil Impurity 283 (CAS CATO-C4X-1128283)
- Sildenafil Impurity 10 (CAS 1393816-99-3)
- Sildenafil Impurity 290 (CAS CATO-C4X-1128290)
- Sildenafil Impurity 245 (CAS CATO-C4X-1128245)
Recommended Standards
- Lubiprostone impurity 5 (CAS CATO-C4X-11365)
- Vardenafil Impurity 66 (CAS CATO-C4X-101766)
- Vardenafil Impurity N19 (CAS 2411340-39-9)
- Vardenafil EP Impurity A (CAS 2169247-39-4)
- Pregabalin Impurity 54 (CAS 51424-01-2)
- Atosiban Impurity 59 (CAS CATO-C4X-229359)
- Paclitaxel EP Impurity R (CAS 158948-96-0)
- 3-Methyl-6-nitrocinnolin-4(1h)-one (CAS 500590-07-8)
- 1-Benzyl-3-methoxy-piperidin-4-ylamine dihydrochloride (CAS 1263377-94-1)
- (2,3-Dihydrobenzofuran-3-yl)methanesulfonamide (CAS 1501172-33-3)
- 1-(2-(Diethylamino)ethyl)guanidine (CAS 13845-72-2)
- Eldecalcitol Impurity 18 (CAS CATO-C4X-214018)
- N-ethyl-5-(1-phenoxyethyl)-1H-pyrazole-1-carboxamide (CAS 241127-12-8)
- Semaglutide impurity 251 (CAS CATO-C4X-2226251)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com