SMILES: C1=CC=C2C(=C1)C=CC=C2N=NC3=C(C=CC4=CC(=CC(=C43)S(=O)(=O)[O-])S(=O)(=O)[O-])O
Description: The molecule is an organosulfonate oxoanion resulting from the removal of a proton from both of the sulfo groups of 7-hydroxy-8-[(naphthalen-1-yl)diazenyl]naphthalene-1,3-disulfonic acid. It is a conjugate base of a 7-hydroxy-8-[(naphthalen-1-yl)diazenyl]naphthalene-1,3-disulfonic acid.