Parecoxib sodium Impurity 21 CAS CATO-C4X-159121
| CAS No. | CATO-C4X-159121 |
| Molecular Formula | C18H16N2O4S |
| Molecular Weight | 356.40 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C18H16N2O4S, Parecoxib sodium Impurity 21 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 356.40 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
CATO supplies Parecoxib sodium Impurity 21 (CAS CATO-C4X-159121), a pharmacopoeial impurity reference standard (molecular formula C18H16N2O4S, MW 356.40 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 | C18H16N2O4S |
| Molecular Weight | 356.40 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Parecoxib Standards
- Parecoxib Impurity 16 (CAS 198471-06-6)
- Parecoxib Impurity 50 (CAS 3026677-40-4)
- Parecoxib Impurity 5 (CAS CATO-C4X-15915)
- Parecoxib Impurity 25 (CAS 1884279-18-8)
- Parecoxib Impurity 59 (CAS CATO-C4X-159159)
- Parecoxib sodium Impurity 10 (CAS 2229657-81-0)
- Parecoxib Impurity 14 (CAS 1709956-89-7)
- Parecoxib sodium Impurity 40 (CAS 2235371-89-6)
Recommended Standards
- Imrecoxib Impurity 49 (CAS CATO-C4X-237949)
- Amisulpride impurity 48 (CAS CATO-C4X-104548)
- Fezolinetant Impurity 32 (CAS CATO-C4X-327032)
- Vonoprazan Impurity 264 (CAS CATO-C4X-1020264)
- Rivaroxaban CMTCA Impurity (CAS 97799-98-9)
- Mitoxantrone Impurity 27 (CAS CATO-C4X-103427)
- Roxadustat Impurity 106 (CAS CATO-C4X-2213106)
- 6-(3-Fluorophenyl)pyrimidine-2,4-diamine (CAS 1247114-85-7)
- 3-(4-Methoxyphenyl)-1-methyl-2-phenylindolizine (CAS 81235-52-1)
- Epinastine impurity 60 (CAS CATO-C4X-184060)
- 2-(2-Chloroethyl)-1-methylpiperidine-d3 Hydrochloride (CAS 1794964-19-4)
- tert-Butyl 3-hydroxy-3-(trifluoromethyl)azepane-1-carboxylate (CAS 1823863-12-2)
- (S)-2-Amino-N-((2-bromopyridin-4-yl)methyl)-N-isopropylpropanamide (CAS 1353994-15-6)
- Ginseng Tetrapeptide (CAS 178553-95-2)
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