COc1ccc(-c2noc(-c3ccc(NCc4cccnc4)c([N+](=O)[O-])c3)n2)cc1OC
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?