5-(Methylthio)isoxazole-3-carboxamide CAS 54593-30-5
| CAS No. | 54593-30-5 |
| Molecular Formula | C5H6N2O2S |
| Molecular Weight | 158.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 5-(Methylthio)isoxazole-3-carboxamide (CAS 54593-30-5), a certified reference material (molecular formula C5H6N2O2S, MW 158.18 g/mol) for analytical method development and quality control.
Based on its molecular formula C5H6N2O2S, 5-(Methylthio)isoxazole-3-carboxamide contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 158.18 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.
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.
Physical & Chemical Properties
| Molecular Formula | C5H6N2O2S |
| Molecular Weight | 158.18 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| 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 |
| CAS Registry Year (est.) | 1972 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Methylthio Standards
- 4-(Methylthio)-1H-1,2,3-triazole-5-carboxamide (CAS 107487-63-8)
- 5-(Methylthio)-1H-1,2,3-triazole-1-carboxamide (CAS 149519-05-1)
- 5-(Methylthio)furan-2-carboxylic acid (CAS 21984-78-1)
- 2-(methylthio)pyrimidine-4,6-diol 29639-68-7 4,6-Dihydroxy-2-methylthiopyrimidine A5506 (CAS 29639-68-7)
- (5-((Methylthio)methyl)-1H-1,2,4-triazol-3-yl)methanamine (CAS 1343502-51-1)
- 1-(Methylthio)cyclopent-3-ene-1-carboxylic acid (CAS 1477902-38-7)
- 1-Methyl-3-((methylthio)methyl)-1H-pyrazol-5-ol (CAS 66708-05-2)
- 2-(Methylthio)pyrimidine-4(3H)-thione (CAS 6303-54-4)
Recommended Standards
- 5,6-Diamino-4-thioxo-3,4-dihydropyrimidin-2(1H)-one (CAS 40848-33-7)
- 5-(Methylamino)thiazole-4-carboxylic acid (CAS 933751-45-2)
- 5-Acetyl-2-thioxoimidazolidin-4-one (CAS 857767-02-3)
- 5-(Mercaptomethyl)pyrimidine-2,4(1H,3H)-dione (CAS 4874-36-6)
- 2,9,12-Trioxa-4-azadispiro[4.2.4.2]tetradecane-1,3-dione (CAS 1567899-09-5)
- 7-Methoxyindolin-2-one (CAS 7699-20-9)
- 4-Epidemeclocycline hydrochloride (CAS 179471-95-5)
- 4-Bromo-N-hydroxy-2-methylbenzene-1-carbonimidoyl chloride (CAS 1937349-21-7)
- 3-Fluoro-4'-methoxy-[1,1'-biphenyl]-4-amine (CAS 893734-49-1)
- Thiophene-2-carboximidamide (CAS 54610-75-2)
- trans-4-[Boc(methyl)amino]cyclohexanol (CAS 400899-99-2)
- Tadalafil Impurity 35 (CAS 2169996-11-4)
- 4-Benzylpyridin-3-amine (CAS 516513-80-7)
- Neuropeptide S (rat) (CAS 412938-75-1)
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