Ketotifen Impurity 35 CAS CATO-C4X-204635
| CAS No. | CATO-C4X-204635 |
| Molecular Formula | C19H19NO2S |
| Molecular Weight | 325.42 g/mol |
| 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 Ketotifen Impurity 35 (CAS CATO-C4X-204635), a pharmacopoeial impurity reference standard (molecular formula C19H19NO2S, MW 325.42 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Ketotifen Impurity 35 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 325.42 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 | C19H19NO2S |
| Molecular Weight | 325.42 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Ketotifen Standards
- Ketotifen EP Impurity D (CAS 88456-70-6)
- Ketotifen Impurity 30 (CAS CATO-C4X-204630)
- Ketotifen Impurity 34 (CAS CATO-C4X-204634)
- Ketotifen EP Impurity G (CAS 43076-16-0)
- Ketotifen EP Impurity C (CAS 126939-27-3)
- Ketotifen Impurity 23 (CAS 111428-56-9)
- Ketotifen Impurity 15 (CAS CATO-C4X-204615)
- Ketotifen Impurity 28 (CAS CATO-C4X-204628)
Recommended Standards
- Duloxetine Impurity 43 (CAS CATO-C4X-133643)
- Dorzolamide Impurity 13 (CAS 897657-78-2)
- Niraparib-d5 (CAS 1038915-60-4 (non-labelled))
- Spegatrine (CAS 47326-53-4)
- Pirfenidone Impurity 48 (CAS CATO-C4X-222948)
- Torasemide impurity 39 (CAS CATO-C4X-183639)
- Creatine impurity 20 (CAS CATO-C4X-120920)
- 3-(Aminomethyl)-3-methoxypentane (CAS 145550-57-8)
- 1. 1-(((2R, 3S)-2-(2,4-difluorophenyl)-3-Methyloxiran-2-yl) Methyl)-1H-1,2,4-triazole (CAS 127000-90-2)
- 72269-94-4 N-Cyclohexyl-N-methyl-1,3,4-thiadiazole-2,5-diamine MFCD15093827 (CAS 72269-94-4)
- 1,5-Naphthyridine-2,6-diamine (CAS 42309-17-1)
- (2S,5R)-3,6-Diethoxy-2,5-dihydro-2-[(2S)-2-[[4-methoxy-3-(3-methoxypropoxy)phenyl]methyl]-3-methylbutyl]-5-(1-methylethyl)pyrazine (CAS 866030-33-3)
- (2R)-2-amino-2-(3-chloro-4-methoxyphenyl)acetic acid (CAS 109971-52-0)
- Semaglutide impurity 84 (CAS CATO-C4X-222684)
Why CATO?
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com