CCN(CC(=O)Nc1ccc(NC(C)=O)cc1)C(=O)c1ccc(N(C)S(=O)(=O)c2ccc(C)cc2)cc1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?