O=C(Nc1cc(Cl)ccc1O)c1cc2nc(-c3ccc4c(c3)OCO4)cc(C(F)(F)F)n2n1
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?