SMILES: C1=CC(=CC=C1N=NC2=C(C=C3C=C(C(=C(C3=C2N)O)N=NC4=CC=C(C=C4)S(=O)(=O)[O-])S(=O)(=O)[O-])S(=O)(=O)[O-])[N+](=O)[O-]
Description: The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfonic acid groups of naphthalene blue black CS (acid form). It is a conjugate base of a naphthalene blue black CS (acid form).