The molecule is a carbohydrate acid anion that is the conjugate base of cellobionic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a cellobionic acid.
(2R,3R,4R,5R)-2,3,5,6-tetrahydroxy-4-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyhexanoate