5-Amino-2-mercaptobenzoic acid CAS 81367-73-9
| CAS No. | 81367-73-9 |
| Molecular Formula | C7H7NO2S |
| Molecular Weight | 169.20 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.
5-Amino-2-mercaptobenzoic acid (CAS 81367-73-9), molecular formula C7H7NO2S and molecular weight 169.20 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 5-Amino-2-mercaptobenzoic acid (C7H7NO2S) is characterized by an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
Physical & Chemical Properties
| Molecular Formula | C7H7NO2S |
| Molecular Weight | 169.20 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1980 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Amino Standards
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- (R)-2-amino-2-(4-fluoro-3-methylphenyl)ethan-1-ol (CAS 1212835-63-6)
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Recommended Standards
- 5-(Methylthio)picolinic acid (CAS 74470-29-4)
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- 5-Methoxypyrazine-2-carbothioamide (CAS 21279-70-9)
- Cannabidiol Monomethyl Ether (CAS 1972-05-0)
- Ethyl 2-amino-4-(furan-2-yl)thiophene-3-carboxylate (CAS 256506-99-7)
- 1-Iodo-4-(tert-pentyl)benzene (CAS 860556-27-0)
- N-(4-bromobenzyl)prop-2-en-1-amine hydrochloride (CAS 99359-27-0)
- 1-(Heptan-4-ylamino)-2-methylpropan-2-ol (CAS 1478413-73-8)
- Ethyl 2-(2-methoxyphenyl)acetate (CAS 62335-65-3)
- (2S,5R)-rel-2-Amino-5-hydroxy-hexanedioic acid diethyl ester hydrochloride (CAS 2376143-32-5)
- 5-(3-(Benzyloxy)phenyl)nicotinic acid (CAS 893740-67-5)
- Quetiapine Impurity 17 (CAS 2459-05-4)
- Semaglutide impurity 62 (CAS CATO-C4X-222662)
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