Omeprazole Impurity 33 CAS CATO-C4X-125533
| CAS No. | CATO-C4X-125533 |
| Molecular Formula | C18H21N3O4S |
| Molecular Weight | 375.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Omeprazole Impurity 33 (CAS CATO-C4X-125533) is a certified pharmaceutical impurity reference standard with the molecular formula C18H21N3O4S and a molecular weight of 375.44 g/mol.
Based on its molecular formula C18H21N3O4S, Omeprazole Impurity 33 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 375.44 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C18H21N3O4S |
| Molecular Weight | 375.44 g/mol |
| 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 |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Omeprazole Standards
- Omeprazole impurity 32 (CAS CATO-C4X-125532)
- Omeprazole EP Impurity I (CAS 158812-85-2)
- Omeprazole acid methyl ester sulfide (CAS 120003-82-9)
- Omeprazole Impurity 50 (CAS CATO-C4X-125550)
- Omeprazole Sulfone-D3 (CAS 1189891-71-1)
- Omeprazole Impurity 11 (CAS CATO-C4X-125511)
- Omeprazole acid methyl ester, 98% (CAS 120003-83-0)
- Omeprazole Impurity 91 (CAS 317807-10-6)
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