O=[N+]([O-])c1cc(Cl)c(O)c(-[n+]2c(-c3ccccc3)cc(-c3ccccc3)cc2-c2ccccc2)c1.[O-][Cl+3]([O-])([O-])[O-]
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?