3-Methylisothiazole-4-carboxylic acid
3-甲基异噻唑-4-羧酸
Also known as: 3-Methyl-1,2-thiazole-4-carboxylic acid, 4-Isothiazolecarboxylic acid, 3-methyl-, 3-Methyl-4-isothiazolecarboxylic acid
3-Methylisothiazole-4-carboxylic acid (CAS 15903-66-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5NO2S and a molecular weight of 143.164 g/mol. It is also known as 3-Methyl-1,2-thiazole-4-carboxylic acid, 4-Isothiazolecarboxylic acid, 3-methyl- and 3-Methyl-4-isothiazolecarboxylic acid. Key properties include a melting point of 235.5-237.5 °C, a boiling point of 182.3±33.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 64.1±25.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 15903-66-9
- Jingsj CID
- J-1496982-9
- Molecular Formula
- C5H5NO2S
- Chinese Name
- 3-甲基异噻唑-4-羧酸
- Molecular Weight
- 143.164 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 235.5-237.5 °C |
|---|---|
| Boiling Point | 182.3±33.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 64.1±25.4 °C |
Frequently Asked Questions
What is the CAS number of 3-Methylisothiazole-4-carboxylic acid?
The CAS number of 3-Methylisothiazole-4-carboxylic acid is 15903-66-9.
What are the molecular formula and molecular weight of 3-Methylisothiazole-4-carboxylic acid?
3-Methylisothiazole-4-carboxylic acid has molecular formula C5H5NO2S and molecular weight 143.164 g/mol.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Methylisothiazole-4-carboxylic acid (CAS 15903-66-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1496982-9 (accessed 2026-10-24).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.