COc1cc(Cl)c(C)cc1NC(=O)CSc1cc(=O)n(C)c2cc(Cl)ccc12
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?