The molecule is a dicarboxylic acid dianion resulting from the deprotonation of both ot the carboxy groups of 5,6,6'-trihydroxy-5'-methoxy[biphenyl]-3,3'-dicarboxylic acid. The major microspecies at pH 7.3. It is an aromatic carboxylate and a dicarboxylic acid dianion. It is a conjugate base of a 5,6,6'-trihydroxy-5'-methoxy[biphenyl]-3,3'-dicarboxylic acid.
4-carboxy-2-(5-carboxy-3-methoxy-2-oxidophenyl)-6-hydroxyphenolate