NC(=O)CNC(=O)[C@@H]1CC2(CC(c3cccc(Br)c3)=NO2)CN1C(=O)c1ccc(Br)cc1
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?