The molecule is a carbohydrate acid anion arising from deprotonation of the carboxy group of 2-dehydro-3-deoxy-L-rhamnonic acid; major species at pH 7.3. It is a conjugate base of a 2-dehydro-3-deoxy-L-rhamnonic acid.
(4R,5S)-4,5-dihydroxy-2-oxohexanoate