3-Methyl-isothiazole-4-carboxylic acid CAS 15903-66-9
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 15903-66-9 |
| Molecular Formula | C5H5NO2S |
| Molecular Weight | 143.16 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 3-Methyl-isothiazole-4-carboxylic acid (CAS 15903-66-9), a pharmaceutical standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C5H5NO2S. Molecular weight: 143.16 g/mol. Batch-specific COA and technical support are available on request.
Physical & Chemical Properties
| Molecular Formula | C5H5NO2S |
| Molecular Weight | 143.16 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1961 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Methyl Standards
- Methyl isothiazole-3-carboxylate (CAS 1001907-72-7)
- Methyl isothiazole-4-carboxylate (CAS 56133-37-0)
- Isothiazole-5-carboxylic Acid (CAS 10271-85-9)
- Isothiazole-3-carboxylic acid (CAS 4576-90-3)
- Isothiazole-4-carboxylic acid (CAS 822-82-2)
- Ethyl isothiazole-3-carboxylate (CAS 23244-32-8)
- Isothiazole-3-carboxamide (CAS 24342-43-6)
- Isothiazole-4-carboxamide (CAS 24340-75-8)
Recommended Standards
- Methylisothiazole-5-carboxylate (CAS 15901-66-3)
- (5-Ethyl-4-fluoro-1H-pyrazol-3-yl)methanamine (CAS 1638759-47-3)
- 4-Methylisothiazole-5-carboxylic acid (CAS 15901-61-8)
- Pefurazoate (CAS 101903-30-4)
- Phenyl (4-(fluorosulfonyl)phenyl)carbamate (CAS 21315-97-9)
- 1-(2-Thioxo-2,3-dihydrobenzo[d]thiazol-5-yl)ethanone (CAS 121942-10-7)
- 2-Bromoheptafluoropropane (CAS 422-77-5)
- N-(thiophen-2-ylmethyl)-2-(2,2,2-trifluoroacetamido)benzamide (CAS 329699-44-7)
- (4E)-1-(4-Methoxyphenyl)-2-methyl-4-(2-phenylhydrazin-1-ylidene)-4,5,6,7-tetrahydro-1H-indole (CAS 477860-50-7)
- Tirzepatide Impurity 25 X TFA Salt (CAS CATO-C4X-324025)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 13829788188 / jacky.chen@cato-chem.com