COc1cc2c(cc1NC(=O)C(C)N1CCN(S(=O)(=O)c3ccc(C)c(C)c3)CC1)oc1ccccc12
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?