3-Methylisoxazole-4-carboxylic acid

3-甲基异恶唑-4-羧酸

Also known as: 3-Methyl-4-isoxazolecarboxylic acid, 3-Methyl-1,2-oxazole-4-carboxylic acid, 4-Isoxazolecarboxylic acid, 3-methyl-, 3-Methylisoxazole-4-carboxylic acid, AKOS PAO-1630, Leflunomide Impurity 6, MFCD01318161

3-Methylisoxazole-4-carboxylic acid (CAS 17153-20-7) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H5NO3 and a molecular weight of 127.098 g/mol. It is also known as 3-Methyl-4-isoxazolecarboxylic acid, 3-Methyl-1,2-oxazole-4-carboxylic acid and 4-Isoxazolecarboxylic acid, 3-methyl-. Key properties include a melting point of 183-190 ºC, a boiling point of 303.6±22.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 137.4±22.3 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 17153-20-7
Jingsj CID: J-8679-0
Molecular Formula: C₅H₅NO₃
Chinese Name: 3-甲基异恶唑-4-羧酸
Molecular Weight: 127.098 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	183-190 ºC
Boiling Point	303.6±22.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	137.4±22.3 °C

Frequently Asked Questions

What is the CAS number of 3-Methylisoxazole-4-carboxylic acid?

The CAS number of 3-Methylisoxazole-4-carboxylic acid is 17153-20-7.

What are the molecular formula and molecular weight of 3-Methylisoxazole-4-carboxylic acid?

3-Methylisoxazole-4-carboxylic acid has molecular formula C5H5NO3 and molecular weight 127.098 g/mol.

Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "3-Methylisoxazole-4-carboxylic acid (CAS 17153-20-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-8679-0 (accessed 2026-10-22).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.