COc1ccc(OC)c(N(CC(=O)Nc2cccnc2)S(=O)(=O)c2ccc(C)cc2)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?