Cc1ccc2c(Cl)cc(Cl)c(OCC(=O)Nc3cc(S(=O)(=O)N(C)C)ccc3C)c2n1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?