CC(=O)NC(c1ccc(F)c(F)c1)c1nc(-c2ccc(F)c(Cl)c2)cs1
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?