COc1ccc(NS(=O)(=O)c2cccc(C(=O)O)c2)cc1S(=O)(=O)N1CCOCC1
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?