Olopatadine Impurity 11 CAS 56427-76-0
| CAS No. | 56427-76-0 |
| Molecular Formula | C19H18O4 |
| Molecular Weight | 310.34 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C19H18O4, Olopatadine Impurity 11 contains a flavonoid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 310.34 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
CATO supplies Olopatadine Impurity 11 (CAS 56427-76-0), a pharmacopoeial impurity reference standard (molecular formula C19H18O4, MW 310.34 g/mol) used for the identification and quantification of trace impurities in APIs.
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.
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 | C19H18O4 |
| Molecular Weight | 310.34 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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 |
| CAS Registry Year (est.) | 1973 |
Related Olopatadine Standards
- Olopatadine Carbaldehyde (CAS CATO-C4X-171815)
- Olopatadine Impurity 19 (CAS 55690-15-8)
- Olopatadine Impurity 26 (CAS 55690-18-1)
- Olopatadine Impurity 35 (CAS 1376615-97-2)
- Olopatadine impurity 146 (CAS CATO-C4X-1135146)
- Olopatadine Impurity 9 (CAS 113835-92-0)
- Olopatadine Impurity N3 (CAS 113835-76-0)
- Olopatadine Impurity 18 (CAS 55453-90-2)
Recommended Standards
- Miglitol Impurity 11 (CAS CATO-C4X-169711)
- Topiramate Impurity 39 (CAS 164024-55-9)
- Ketoprofen Impurity 113 (CAS CATO-C4X-1471113)
- Warfarin impurity 14 (CAS CATO-C4X-17814)
- Venetoclax Impurity 111 (CAS CATO-C4X-2495111)
- Bixalomer Impurity 2 (CAS 120239-63-6)
- Flurbiprofen Impurity 75 (CAS CATO-C4X-144475)
- 2-[2-(2-butoxyethoxy)ethoxy]ethane-1-sulfonamide (CAS 1343451-87-5)
- 3,4-dimethylthiophene-2-carboxylic acid (CAS 89639-74-7)
- (E)-({6-[(2-chlorophenyl)sulfanyl]pyridin-3-yl}methylidene)[(2,4-dichlorophenyl)methoxy]amine (CAS 339014-88-9)
- 1,2,2,3,3,4,4,5,5,6,6-undecafluoro-1-cyclohexanecarbonyl chloride 1,2,2,3,3,4,4,5,5,6,6-undecakis(fluoranyl)cyclohexane-1-carbonyl chloride 58816-79-8 A832031 (CAS 58816-79-8)
- Ethyl (4-iodophenyl)glycinate (CAS 14108-76-0)
- 2-Cyanobenzamide (CAS 17174-98-0)
- Casein Kinase II Receptor Peptide (CAS 198481-81-1)
Why CATO?
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- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com