The molecule is an amino acid zwitterion obtained by transfer of a proton from the amino to the carboxy group of (2S)-2-acetamido-4-aminobutanoic acid; major species at pH 7.3. It is a tautomer of a (2S)-2-acetamido-4-aminobutanoic acid.
(2S)-2-acetamido-4-azaniumylbutanoate