Tadalafil Impurity 20 CAS 171752-68-4
| CAS No. | 171752-68-4 |
| Molecular Formula | C20H18N2O4 |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C20H18N2O4HCl, Tadalafil Impurity 20 contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 386.83 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).
Tadalafil Impurity 20 (CAS 171752-68-4) is a certified pharmaceutical impurity reference standard with the molecular formula C20H18N2O4HCl and a molecular weight of 386.83 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.
CATO manufactures Tadalafil Impurity 20 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 | C20H18N2O4 HCl |
| Molecular Weight | 386.83 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | >95% |
| Storage | Store at 2-8°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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2006 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Tadalafil Standards
- Tadalafil Impurity 10 (CAS 100077-49-4)
- Tadalafil Impurity 75 (CAS 1093940-68-1)
- Tadalafil Impurity 76 (CAS 1093940-70-5)
- Tadalafil Impurity 99 (CAS 114152-23-7)
- Tadalafil Impurity 11 HCl (CAS 1190238-20-0)
- 【禁售不询】Tadalafil Impurity 43 (CAS 120-57-0)
- Tadalafil Impurity N1 (CAS 1220393-12-3)
- Tadalafil Impurity 119 (CAS 130812-44-1)
Recommended Standards
- Loxoprofen Impurity 96 (CAS CATO-C4X-148896)
- Piracetam Impurity 17 (CAS 64026-51-3)
- Etoricoxib Impurity 2 (CAS 316149-01-6)
- (1-(3,5-Dichlorobenzyl)piperidin-4-yl)methanamine (CAS 1283585-13-6)
- 1-(4-bromophenyl)-3,4-dimethyl-1H-pyrazol-5-amine (CAS 1955547-51-9)
- 4-Ethyl-2-quinolinamine (CAS 126921-60-6)
- 4-[Hydroxy(4-methoxyphenyl)methyl]benzonitrile (CAS 174813-84-4)
- tert-Butyl 3-((benzyloxycarbonylamino)methyl)-4,4-difluoropiperidine-1-carboxylate (CAS 1881321-39-6)
- 6-Hydroxy-8-methoxy-10-methyl-1,2,3,4-tetrahydroacridin-9(10H)-one (CAS 88673-40-9)
- Tirzepatide-d7 Ditrifluoroacetate (CAS CATO-CPTD788698)
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