O=C(NCc1nnc(S)n1-c1cccc(C(F)(F)F)c1)c1ccc(S(=O)(=O)N2CCCC2)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?