O=C(CF)NC(N=C(S)Nc1cccc([N+](=O)[O-])c1)C(Cl)(Cl)Cl
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?