SMILES: COC1=C(C=CC(=C1)C2=CC(=C(C=C2)N=NC3=C(C4=C(C=C(C=C4C=C3S(=O)(=O)[O-])S(=O)(=O)[O-])N)O)OC)N=NC5=C(C6=C(C=C(C=C6C=C5S(=O)(=O)[O-])S(=O)(=O)[O-])N)O
Description: The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfonic acid groups of Pontamine sky blue 5B (acid form). It is a conjugate base of a Pontamine sky blue 5B (acid form).