5-Methyl-3-phenylisoxazole-4-carboxylic acid

5-甲基-3-苯基异噁唑-4-羧酸

Also known as: 5-Methyl-3-phenyl-1,2-oxazole-4-carboxylic acid, 4-Isoxazolecarboxylic acid, 5-methyl-3-phenyl-, 5-Methyl-3-phenyl-4-isoxazolecarboxylic acid, PMI-acid, Oxacillin impurity C, Oxacillin related compound C

5-Methyl-3-phenylisoxazole-4-carboxylic acid (CAS 1136-45-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C11H9NO3 and a molecular weight of 203.194 g/mol. It is also known as 5-Methyl-3-phenyl-1,2-oxazole-4-carboxylic acid, 4-Isoxazolecarboxylic acid, 5-methyl-3-phenyl- and 5-Methyl-3-phenyl-4-isoxazolecarboxylic acid. Key properties include a melting point of 192-194 °C(lit.), a boiling point of 365.0±37.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 174.5±26.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

1136-45-4

Jingsj CID

J-30994-5

Molecular Formula

C₁₁H₉NO₃

Chinese Name

5-甲基-3-苯基异噁唑-4-羧酸

Molecular Weight

203.194 g/mol

Category

Organic Acids

Last updated

8/21/2026