The molecule is an amino acid zwitterion resulting from a transfer of a proton from the carboxy group to the amino group of 3-(5-oxoisoxazolin-2-yl)-L-alanine; major species at pH 7.3. It is a tautomer of a 3-(5-oxoisoxazolin-2-yl)-L-alanine.
(2S)-2-azaniumyl-3-(5-oxo-1,2-oxazol-2-yl)propanoate