Tolterodine impurity 33 CAS CATO-C4X-176733
| CAS No. | CATO-C4X-176733 |
| Molecular Formula | C16H19NO |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Tolterodine impurity 33 (CAS CATO-C4X-176733), a pharmacopoeial impurity reference standard (molecular formula C16H19NOHCl, MW 277.79 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, Tolterodine impurity 33 is typically off-white to pale yellow low-melting solid. Its solid-state physicochemical attributes — including a molecular weight of 277.79 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
Physical & Chemical Properties
| Molecular Formula | C16H19NO HCl |
| Molecular Weight | 277.79 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
Related Tolterodine Standards
- Tolterodine Impurity 21 (CAS 1043911-42-7)
- Tolterodine EP Impurity C (CAS 1161940-88-0)
- Tolterodine Impurity N5 (CAS 1189501-90-3)
- Rac- Tolterodine-D14 Hydrochloride (CAS 1246816-99-8)
- rac-Tolterodine-d14 Tartrate (CAS 1246911-91-0)
- Tolterodine Impurity 4 (CAS 124935-88-2)
- Tolterodine Impurity 18 (CAS 124935-89-3)
- rac-Tolterodine hydrochloride, 98% (CAS 124936-75-0)
Recommended Standards
- Abemaciclib Impurity 2 (CAS 1528469-78-4)
- Gadobutrol Impurity 12 4HCl (CAS 10045-25-7)
- Upadacitinib Impurity 143 (CAS CATO-C4X-2405143)
- 1-[3-(2-chloroethyl)-4-hydroxyphenyl]ethan-1-one (CAS 1354950-68-7)
- tert-butyl (4S)-4-methyl-2,2-dioxo-1,2λ⁶,3-oxathiazolidine-3-carboxylate (CAS 439948-91-1)
- Ziprasidone Impurity 23 (CAS CATO-C4X-124023)
- 5-Fluoro-2,4-dimethoxyaniline (CAS 195136-65-3)
- N-methyl-3-(propan-2-yl)aniline (CAS 117802-45-6)
- 6-Fluoropyrimidine-2,4(1H,3H)-dione (CAS 591-36-6)
- Tirzepatide Impurity 44 (CAS CATO-C4X-324044)
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