COc1cc([N+](=O)[O-])c(S(=O)(=O)[O-])cc1-n1nc(-c2ccccc2)n[n+]1-c1cc(S(=O)(=O)[O-])c([N+](=O)[O-])cc1OC.[Na+]
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?