CCN(CC)S(=O)(=O)c1ccc(NC(=O)C(C)N(c2ccccc2)S(C)(=O)=O)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?