COc1ccc(S(=O)(=O)N[C@@H](Cc2ccc(Cl)cc2)C(=O)N2CC[C@@]3(O)CCCC[C@H]3C2)cc1
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?