COc1ccc(C(=O)Nc2ccc(S(=O)(=O)Nc3cc(C)nc(C)n3)cc2)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?