Ketotifen Impurity 32 CAS 81759-45-7
| CAS No. | 81759-45-7 |
| Molecular Formula | C25H27NO7S |
| Molecular Weight | 485.55 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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 process- or degradation-related impurity, Ketotifen Impurity 32 (CAS 81759-45-7, C25H27NO7S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Structurally, Ketotifen Impurity 32 (C25H27NO7S) 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 13.0, corresponding to approximately 13 ring(s) or double-bond equivalent(s). With a molecular weight of 485.55 g/mol, it falls into the moderately-high-molecular-weight range. 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 Ketotifen Impurity 32 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 | C25H27NO7S |
| Molecular Weight | 485.55 g/mol |
| Purity | ≥95% |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1980 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Ketotifen Standards
- Ketotifen Impurity 21 (CAS CATO-C4X-204621)
- Ketotifen Impurity 29 (CAS CATO-C4X-204629)
- Ketotifen Impurity 26 (CAS CATO-C4X-204626)
- Ketotifen Impurity 16 (CAS CATO-C4X-204616)
- Ketotifen Impurity 14 (CAS CATO-C4X-204614)
- Ketotifen EP Impurity B (Enantiomer Mixture) (CAS 59743-88-3)
- Ketotifen Impurity 25 (CAS CATO-C4X-204625)
- Ketotifen Impurity 27 (CAS CATO-C4X-204627)
Recommended Standards
- N-[4-(Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]octadecanamide (CAS 2490665-97-7)
- (5-(4-(2-(S)-Boc-amino-propionylamino)phenylsulfanyl)-1H-benzoimidazol-2-yl)carbamic acid methyl ester (CAS 284019-53-0)
- N-[3-(Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]octadecanamide (CAS 2490666-06-1)
- N-(2-(2-Amino-3-(phenylsulfonyl)-1H-pyrrolo[2,3-b]quinoxalin-1-yl)ethyl)-4-methylbenzamide (CAS 381714-44-9)
- Azlocillin Impurity 4 (CAS CATO-C4X-23204)
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- 2-(Isopropylamino)-2-methyl-4-(1h-pyrazol-1-yl)butanamide (CAS 1247606-33-2)
- 155908-58-0 3-(2,2,2-Trifluoroethoxy)benzaldehyde 4893AD C9H7F3O2 (CAS 155908-58-0)
- n-(1-Acetyl-2,3-dihydro-1h-indol-5-yl)-2-chloroacetamide (CAS 893722-06-0)
- Ethyl 3-(3-fluoro-4-methoxyphenyl)-2-methylprop-2-enoate (CAS 1609289-58-8)
- 2-Methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridazin-3(2H)-one (CAS 1527525-02-5)
- Des-Trp25-Tirzepatide (CAS CATO-CPTD788948)
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