Olopatadine Impurity 18 CAS 55453-90-2
| CAS No. | 55453-90-2 |
| Molecular Formula | C18H16O4 |
| Molecular Weight | 296.32 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Olopatadine Impurity 18 (CAS 55453-90-2) is a certified pharmaceutical impurity reference standard with the molecular formula C18H16O4 and a molecular weight of 296.32 g/mol.
Based on its molecular formula C18H16O4, Olopatadine Impurity 18 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 296.32 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.
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.
CATO manufactures Olopatadine Impurity 18 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C18H16O4 |
| Molecular Weight | 296.32 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.) | 1972 |
Related Olopatadine Standards
- Olopatadine Impurity 66 (CAS CATO-C4X-171866)
- Olopatadine Impurity 26 (CAS 55690-18-1)
- Olopatadine lmpurity 58 (CAS CATO-C4X-171858)
- Olopatadine Impurity 20 (CAS 962-95-8)
- Olopatadine Impurity 28 (CAS 55453-89-9)
- Olopatadine Carbaldehyde (CAS CATO-C4X-171815)
- Olopatadine Impurity 25 (CAS 88630-37-9)
- Olopatadine Impurity 11 (CAS 56427-76-0)
Recommended Standards
- Atenolol Impurity 20 (CAS CATO-C4X-154920)
- Pentoxifylline Impurity 26 (CAS CATO-C4X-172826)
- Doxofylline impurity 44 (CAS CATO-C4X-151344)
- Cabozantinib Impurity 11 (CAS 748707-58-6)
- Vildagliptin Impurity 70 (CAS 79108-51-3)
- Atrasentan Impurity 68 (CAS 1058402-54-2)
- Falecalcitriol impurity 4 (CAS CATO-C4X-31414)
- Ethanol-D6 (CAS 1516-08-1)
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- 3-amino-7-bromo-1-benzothiophene-2-carboxylic acid (CAS 1780193-19-2)
- 6-Bromo-3-fluoro-2-(piperidin-1-yl)pyridine (CAS 887571-39-3)
- 2-Amino-4-methyl-1,3-thiazole-5-sulfonamide (CAS 187230-38-2)
- N-(5-bromopyridin-3-yl)-N-methylmethanesulfonamide (CAS 1240287-01-7)
- Neuropeptide EI (human, mouse, rat) (CAS 125934-45-4)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com