4-Mercaptonicotinic acid CAS 18103-73-6
| CAS No. | 18103-73-6 |
| Molecular Formula | C6H5NO2S |
| Molecular Weight | 155.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-Mercaptonicotinic acid.
CATO supplies 4-Mercaptonicotinic acid (CAS 18103-73-6), a certified reference material (molecular formula C6H5NO2S, MW 155.17 g/mol) for analytical method development and quality control.
Based on its molecular formula C6H5NO2S, 4-Mercaptonicotinic 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 155.17 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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.
As a certified reference material (CRM), 4-Mercaptonicotinic acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C6H5NO2S |
| Molecular Weight | 155.17 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.) | 1962 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Mercaptonicotinic Standards
- 5-Mercaptonicotinic acid (CAS 24242-21-5)
- 6-Mercaptonicotinic acid 6-Mercaptopyridine-3-carboxylic acid 6-mercaptonicotinic acid, tech., 90% 6-mercaptonicotinicacidtech.90% 6-mercaptopyridine-3-carboxylic acid technical grade, 90% 6-mercaptopyridine-3-carboxylic acid,6-mercaptonicotinic acid 92823-43-3 specs aj-333/25022012 timtec-bb sbb004027 (CAS 92823-43-3)
Recommended Standards
- 2-Amino-2-(2-fluorophenyl)ethan-1-ol (CAS 179811-62-2)
- 4-Mercaptopicolinic acid (CAS 18103-74-7)
- 2-Amino-2-(3-fluorophenyl)ethanol (CAS 179811-61-1)
- 3-Mercaptoisonicotinic acid (CAS 18103-75-8)
- 2-Amino-4,5-bis(4-methoxyphenyl)furan-3-carbonitrile (CAS 94556-80-6)
- 6-Bromo-3-nitroquinolin-4(1H)-one (CAS 1429502-75-9)
- 2-Ethoxy-5-methylaniline (CAS 6331-70-0)
- Hydroquinidine (CAS 1435-55-8)
- (R)-3-amino-3-(3,5-dimethoxyphenyl)propanoic acid (CAS 744193-65-5)
- Pregabalin Impurity 125 (CAS CATO-C4X-1312125)
- Tert-butyl (2S,5S)-2-(bromomethyl)-5-methylmorpholine-4-carboxylate (CAS 2440199-03-9)
- Dotinurad Impurity 21 (CAS CATO-C4X-249421)
- tert-Butyl 4-hydroxy-4-isobutylpiperidine-1-carboxylate (CAS 1192122-38-5)
- Semaglutide impurity 72 (CAS CATO-C4X-222672)
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