COc1ccc(C(C)(O)c2nc(-c3ccc(S(C)(=O)=O)cc3)cs2)cc1
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?