Parecoxib Impurity 71 CAS 2304623-38-7
| CAS No. | 2304623-38-7 |
| Molecular Formula | C19H18N2O4S |
| Molecular Weight | 370.42 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Parecoxib Impurity 71 (CAS 2304623-38-7) is a certified pharmaceutical impurity reference standard with the molecular formula C19H18N2O4S and a molecular weight of 370.42 g/mol.
Parecoxib Impurity 71 (C19H18N2O4S) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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.
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 | C19H18N2O4S |
| Molecular Weight | 370.42 g/mol |
| Purity | >95% |
| 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1999 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Parecoxib Standards
- Parecoxib sodium Impurity 10 (CAS 2229657-81-0)
- Parecoxib Impurity 14 (CAS 1709956-89-7)
- Parecoxib sodium Impurity 40 (CAS 2235371-89-6)
- Parecoxib Impurity 46 (CAS 477594-28-8)
- Parecoxib (CAS 198470-84-7)
- Parecoxib Impurity 62 (CAS 2304623-36-5)
- Parecoxib Impurity 63 (CAS 2242749-02-4)
- Parecoxib Impurity 50 (CAS 3026677-40-4)
Recommended Standards
- Sulpiride impurity 14 (CAS CATO-C4X-187614)
- Pimavanserin Impurity 41 (CAS CATO-C4X-193841)
- Avacopan Impurity 6 (CAS 2763538-64-1)
- Esomeprazole-d3 Sodium Salt (CAS CATO-CCAD301902)
- Melphalan Impurity 35 (CAS CATO-C4X-198835)
- Apalutamide Impurity 17 (CAS CATO-C4X-274917)
- Folic Acid Impurity 54 (CAS CATO-C4X-139554)
- 1-(2-Hydroxyethyl)-4,6-diphenylpyridin-2(1H)-one (CAS 99895-18-8)
- 1-Amino-4-methylcyclohexane-1-carbonitrile (CAS 519181-20-5)
- 4-Chloro-N-hydroxybenzamide (CAS 1613-88-3)
- N-(2-chlorobenzyl)-2-((2-methoxyethyl)amino)acetamide hydrochloride (CAS 1576093-97-4)
- 4-Butoxy-2,3-difluoro-4'-((1s,4r)-4-propylcyclohexyl)-1,1'-biphenyl (CAS 323178-03-6)
- Cyclobutane-1,1,2-tricarboxylic acid (CAS 2144-31-2)
- D-[His]1-Semaglutide (CAS CATO-C4X-222652)
Why CATO?
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