The molecule is the L-alpha-amino acid zwitterion formed from L-4-hydroxyglutamic semialdehyde by transfer of a proton from the carboxy to the amine group; it is the principal microspecies at pH 7.3. It is a tautomer of a L-4-hydroxyglutamic semialdehyde.
(2S,4R)-2-azaniumyl-4-hydroxy-5-oxopentanoate