The molecule is a dicarboxylic acid dianion resulting from the removal of a proton from both of the carboxy groups of 2-O-caffeoylglucaric acid; major species at pH 7.3. It is a dicarboxylic acid dianion and a carbohydrate acid derivative anion. It is a conjugate base of a 2-O-caffeoylglucaric acid.
(2R,3S,4S,5S)-2-[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy-3,4,5-trihydroxyhexanedioate