2-Mercapto-5-nitrobenzoic acid CAS 99334-37-9
| CAS No. | 99334-37-9 |
| Molecular Formula | C7H5NO4S |
| Molecular Weight | 199.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
2-Mercapto-5-nitrobenzoic acid (CAS 99334-37-9) is a high-purity analytical reference standard with the molecular formula C7H5NO4S and a molecular weight of 199.18 g/mol.
Based on its molecular formula C7H5NO4S, 2-Mercapto-5-nitrobenzoic acid contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 199.18 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
CATO manufactures 2-Mercapto-5-nitrobenzoic acid 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 | C7H5NO4S |
| Molecular Weight | 199.18 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Mercapto Standards
- 3-Mercapto-4-nitrobenzoic acid (CAS 62486-43-5)
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- 2-(2-Mercapto-6-oxo-1,6-dihydropyrimidin-4-yl)-N-methylacetamide (CAS 1105191-77-2)
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- 5-Butyl-2-mercapto-6-methylpyrimidin-4-ol (CAS 29113-41-5)
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Recommended Standards
- 2-Fluoro-4-nitro-1-propoxybenzene (CAS 956015-41-1)
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- 2-Amino-3,5-dimethylpyridine (CAS 41995-30-6)
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- Methyl {[2-(4,6-dimethoxypyrimidine-2-yl)-1-benzothien-3-yl]oxy}acetate (CAS 849924-94-3)
- Ethyl 2-(methylamino)propanoate (CAS 56428-90-1)
- 1-Chloro-3-iodo-5-nitrobenzene (CAS 123158-76-9)
- 9-Bromo-N-(1-iminoethyl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-2-carboxamide (CAS 1628256-47-2)
- 4-chloro-1-isopropyl-pyrazolo[3,4-d]pyrimidine (CAS 21254-15-9)
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- ML348 (CAS 899713-86-1)
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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
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com