Parecoxib sodium Impurity 18 CAS 181696-73-1
| CAS No. | 181696-73-1 |
| Molecular Formula | C16H15NO2 |
| Molecular Weight | 253.30 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Parecoxib sodium Impurity 18 (CAS 181696-73-1), a pharmacopoeial impurity reference standard (molecular formula C16H15NO2, MW 253.30 g/mol) used for the identification and quantification of trace impurities in APIs.
Parecoxib sodium Impurity 18 (C16H15NO2) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. Its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C16H15NO2 |
| Molecular Weight | 253.30 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| 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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2008 |
| Nitrogen Atoms | 1 |
Related Parecoxib Standards
- Parecoxib Impurity 75 (CAS CATO-C4X-159175)
- Parecoxib Impurity 72 (CAS CATO-C4X-159172)
- Parecoxib Impurity 22 (CAS 139395-94-1)
- Parecoxib sodium Impurity 19 (CAS 37928-17-9)
- Parecoxib Impurity 45 (CAS 75115-00-3)
- Parecoxib Impurity 73 (CAS CATO-C4X-159173)
- Parecoxib sodium Impurity 20 (CAS 952-06-7)
- Parecoxib sodium Impurity 17 (CAS 451-40-1)
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Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com