4-Amino-2-methylbenzenesulfonic acid CAS 133-78-8
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 133-78-8 |
| Molecular Formula | C7H9NO3S |
| Molecular Weight | 187.22 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 4-Amino-2-methylbenzenesulfonic acid (CAS 133-78-8), a pharmaceutical standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C7H9NO3S. Molecular weight: 187.22 g/mol. Batch-specific COA and technical support are available on request.
Physical & Chemical Properties
| Molecular Formula | C7H9NO3S |
| Molecular Weight | 187.22 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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Amino Standards
- Methyl 5-amino-3-(methylthio)-1H-pyrazole-4-carboxylate (CAS 117717-02-9)
- 2-Amino-n-methylpyridine-3-sulfonamide (CAS 1250972-58-7)
- 2-Amino-3-(methylsulfonyl)phenol (CAS 129318-50-9)
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Recommended Standards
- 2-Methoxy-N-(5-methyl-1,3,4-thiadiazol-2-yl)acetamide (CAS 132214-40-5)
- ethyl 4-hydroxy-5-methyl-1,3-thiazole-2-carboxylate (CAS 133833-93-9)
- 2,6-Diamino-5-propylpyrimidine-4-carboxylic acid (CAS 13166-62-6)
- Fmoc-N-amido-dPEG <SUP>®</SUP><SUB>8</SUB>-NHS ester (CAS 1334170-03-4)
- 4-Chloro-N-methyl-5-(methylthio)-6-(pyrrolidin-1-yl)pyrimidin-2-amine (CAS 400074-29-5)
- (1S,2R)-1-Amino-2-methylcyclopentanecarboxylic acid (CAS 309757-06-0)
- Taletrectinib Impurity7 (CAS 1012344-76-1)
- 1-(4-(Aminomethyl)piperidin-1-yl)-2-ethylhexan-1-one hydrochloride (CAS 1588901-35-2)
- 3-(1-Methylhydrazinyl)benzo[d]isothiazole 1,1-dioxide (CAS 303064-94-0)
- Tirzepatide Impurity 37 (CAS CATO-C4X-324037)
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 13829788188 / jacky.chen@cato-chem.com