SMILES: C1=CC(=C(C=C1N=NC2=CC(=C(C=C2)[O-])C(=O)O)C(=O)O)[O-]
Description: The molecule is a dicarboxylic acid dianion obtained by deprotonation of both carboxy groups of 3,3'-azobis(6-hydroxybenzoic acid) (olsalazine). It is a conjugate base of an olsalazine.