CCOc1cccc(C(=O)Nc2nc(-c3ccc(S(=O)(=O)N4CCOCC4)cc3)cs2)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?