Cc1cc(C(F)F)n2ncc(C(=O)NCCc3ccc(Cl)cc3)c2n1
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?