The molecule is an L-alpha-amino acid zwitterion that results from the transfer of a proton from the carboxylic acid group to the alpha-amino group of N(3)-fumaramoyl-(S)-2,3-diaminopropanoic acid; major species at pH 7.3. It is a tautomer of a N(3)-fumaramoyl-(S)-2,3-diaminopropanoic acid.
(2S)-3-[[(E)-4-amino-4-oxobut-2-enoyl]amino]-2-azaniumylpropanoate