SMILES: C1=CC=C(C=C1)[N+]2=C3C=C(C4=C(C3=NC5=CC=CC=C52)C=CC(=C4)S(=O)(=O)[O-])NC6=C(C=C(C=C6)S(=O)(=O)[O-])S(=O)(=O)[O-]
Description: The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfo groups of 4-[(7-phenyl-3-sulfobenzo[a]phenazin-5-ylidene)amino]benzene-1,3-disulfonic acid. It is a conjugate base of an azocarmine B free acid.