The molecule is a 2-hydroxy-4-oxobutane-1,2,4-tricarboxylate resulting from the deprotonation of all three carboxy groups of (2S)-2-hydroxy-4-oxobutane-1,2,4-tricarboxylic acid; the major species at pH 7.3. It is a conjugate base of a (2S)-2-hydroxy-4-oxobutane-1,2,4-tricarboxylic acid.
(2S)-2-hydroxy-4-oxobutane-1,2,4-tricarboxylate