COc1ccc(N/C(=C(/C(Cl)=C(Cl)Cl)[N+](=O)[O-])n2nnc3ccccc32)cc1
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?