Cc1ccc(S(=O)(=O)Nc2cc(C(=O)Nc3cc(C)cc(C)c3)ccc2Cl)cc1
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?