Ketotifen Impurity 20 CAS CATO-C4X-204620
| CAS No. | CATO-C4X-204620 |
| Molecular Formula | C19H21NOS |
| Molecular Weight | 311.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Ketotifen Impurity 20 (C19H21NOS) contains a steroid core, an amide group, sulfur-containing functionality, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 10.0, corresponding to approximately 10 ring(s) or double-bond equivalent(s). With a molecular weight of 311.44 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Ketotifen Impurity 20 (CAS CATO-C4X-204620) is a certified pharmaceutical impurity reference standard with the molecular formula C19H21NOS and a molecular weight of 311.44 g/mol.
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.
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.
Physical & Chemical Properties
| Molecular Formula | C19H21NOS |
| Molecular Weight | 311.44 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Ketotifen Standards
- Ketotifen (CAS 34580-13-7)
- Ketotifen EP Impurity F (Mixture of Enol and Ketone) (CAS 34580-09-1)
- Ketotifen EP Impurity E (CAS 1346603-71-1)
- Ketotifen Impurity 28 (CAS CATO-C4X-204628)
- Ketotifen Impurity 15 (CAS CATO-C4X-204615)
- Ketotifen Impurity 23 (CAS 111428-56-9)
- Ketotifen EP Impurity G (CAS 43076-16-0)
- Ketotifen Impurity 30 (CAS CATO-C4X-204630)
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- Poly(I:C) (CAS 24939-03-5)
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