NC(=O)[C@@H]1CC2(CC(c3cccc(NC(=O)[C@H]4CCC(=O)N4)c3)=NO2)CN1C(=O)c1ccc(Cl)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?