COc1ccc(S(=O)(=O)N(C)CC(=O)Nc2ccc(C(F)(F)F)cc2)cc1Cl
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?