O=C(CNC(=O)c1ccc2[nH]nnc2c1)OC(C(=O)Nc1cc(C(F)(F)F)ccc1Cl)c1ccccc1
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?