CCOC(=O)c1c(NC(=O)CSc2nc3cc(Cl)ccc3c(=O)n2Cc2ccco2)sc(C(=O)N(C)C)c1C
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?