Cc1ccc(-c2cc(-c3ccccc3)cc(-c3ccccc3)[n+]2-c2ccccc2C(=O)O)cc1.[O-][Cl+3]([O-])([O-])[O-]
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?