COc1cc(OC)cc(C(=O)NNC(=O)c2ccc(S(=O)(=O)N3CC(C)OC(C)C3)cc2)c1
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?