SMILES: C1=CC(=CC=C1N=NC2=CC(=C(C=C2)N)S(=O)(=O)[O-])S(=O)(=O)[O-]
Description: The molecule is an organosulfonate oxoanion resulting from the removal of a proton from both of the sulfo groups of 4-aminoazobenzene-3,4'-disulfonic acid. It is a conjugate base of a 4-aminoazobenzene-3,4'-disulfonic acid.