1-(2-Methyl-4,5-disulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid CAS 293327-21-6
| CAS No. | 293327-21-6 |
| Molecular Formula | C11H10N2O9S2 |
| Molecular Weight | 378.34 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| 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.
1-(2-Methyl-4,5-disulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid (CAS 293327-21-6) is a high-purity analytical reference standard with the molecular formula C11H10N2O9S2 and a molecular weight of 378.34 g/mol.
1-(2-Methyl-4,5-disulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid (C11H10N2O9S2) contains a carbohydrate-derived structure, an amide group, a sulfone group. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C11H10N2O9S2 |
| Molecular Weight | 378.34 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
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- Semaglutide impurity 99 (CAS CATO-C4X-222699)
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