Cefpodoxime Proxetil Impurity 18 CAS CATO-C4X-157918
| CAS No. | CATO-C4X-157918 |
| Molecular Formula | C15H17N5O7S2 |
| Molecular Weight | 443.45 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
As a process- or degradation-related impurity, Cefpodoxime Proxetil Impurity 18 (CAS CATO-C4X-157918, C15H17N5O7S2) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C15H17N5O7S2, Cefpodoxime Proxetil Impurity 18 contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 443.45 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
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 | C15H17N5O7S2 |
| Molecular Weight | 443.45 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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 |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 5 |
| Sulfur Atoms | 2 |
Related Cefpodoxime Standards
- Cefpodoxime Proxetil Impurity 37 (CAS CATO-C4X-157937)
- Cefpodoxime-d3 Acid (CAS CATO-CCAD303848)
- Cefpodoxime Impurity 56 (CAS CATO-C4X-157956)
- Cefpodoxime Proxetil Impurity 42 (CAS CATO-C4X-157942)
- Cefpodoxime sodium (CAS 82619-04-3)
- Cefpodoxime Proxetil EP Impurity A (CAS 80210-62-4)
- Cefpodoxime Proxetil Impurity 16 (CAS CATO-C4X-157916)
- Cefpodoxime Impurity 57 (CAS CATO-C4X-157957)
Recommended Standards
- Cefoxitin Impurity 14 (CAS CATO-C4X-157814)
- Entacapone Impurity 35 (CAS CATO-C4X-162935)
- Cefuroxime Impurity 91 (CAS CATO-C4X-124591)
- Minocycline EP Impurity C (CAS 4708-96-7)
- Econazole Impurity 8 (CAS 14866-28-5)
- Glipizide Impurity 38 (CAS CATO-C4X-140738)
- Letrozole Impurity 6 (CAS 134521-16-7)
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- Tert-butyl 4-carbamoyl-4-(4-fluorobenzyl)piperidine-1-carboxylate (CAS 906329-65-5)
- (3-Bromophenyl)(4-ethylphenyl)methanol (CAS 333360-85-3)
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- Ethyl (2-bromo-4-methylphenyl)carbamate (CAS 112671-44-0)
- Prolactin-Releasing Peptide (12-31) (human) (CAS 235433-36-0)
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