Cc1ccc(S(=O)(=O)N2[C@H](c3cccc(C)c3)CC=C(C(=O)O)[C@@H]2c2ccc(Cl)cc2)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?