5-Methylisoxazole-4-carboxylic acid

Abstract

In the title compound, C5H5NO3, the molecule lies on a crystallographic mirror plane with one half-molecule in the asymmetric unit. An intramolecular C—H...O interaction is present. In the crystal, strong intermolecular O—H...N hydrogen bonds result in the formation of a linear chain structure along [100], and there are also weak C—H...O hydrogen bonds between the chains which help to stabilize the crystal packing.