Besifloxacin Impurity 4 CAS CATO-C4X-10044
| CAS No. | CATO-C4X-10044 |
| Molecular Formula | C19H21ClFN3O3 |
| Molecular Weight | 393.84 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Besifloxacin Impurity 4 (CAS CATO-C4X-10044, C19H21ClFN3O3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Structurally, Besifloxacin Impurity 4 (C19H21ClFN3O3) contains a steroid core, an amide group, a hydroxyl group, an ether linkage, fluorine/chlorine substitution. 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 393.84 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).
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 | C19H21ClFN3O3 |
| Molecular Weight | 393.84 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| 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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | F/Cl-containing |
| Nitrogen Atoms | 3 |
Related Besifloxacin Standards
Recommended Standards
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- Rivaroxaban Impurity 163 (CAS 2422046-61-3)
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- Bilastine impurity 116 (CAS 93142-62-2)
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- Ethyl 3-(3,4-Dimethoxyphenyl)-3-hydroxy-2-(2-methoxyphenoxy)propionate (CAS 94687-10-2)
- 1,1,1-trifluoro-3-sulfanylpropan-2-one (CAS 127183-53-3)
- Dimenhydrinate Impurity C2 (CAS 2212-35-3)
- tert-Butyl ((1-(4-chloro-5-methylpyrimidin-2-yl)piperidin-3-yl)methyl)carbamate (CAS 1261230-27-6)
- 3-Bromo-5-hydroxyphenylboronic acid (CAS 2096341-66-9)
- 3-Fluoro-2-methoxybenzaldehyde (CAS 74266-68-5)
- Tirzepatide Impurity 17 (CAS CATO-C4X-324017)
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