COc1ccc(N(CC(=O)Nc2cccc(C(C)=O)c2)S(=O)(=O)c2ccccc2)c(OC)c1
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?