SMILES: C1=CC=C(C(=C1)N=NC2=CC=CC=C2S(=O)(=O)[O-])S(=O)(=O)[O-]
Description: The molecule is the arenesulfonate that is the dianion formed by proton loss from each of the sulfo groups in 2,2'-disulfoazobenzene; major microspecies at pH 7.3. It is a conjugate base of a 2,2'-disulfoazobenzene.