COc1cc(NS(=O)(=O)c2ccc(NC(=S)NC(=O)/C=C/c3ccc(OC)c(OC)c3)cc2)ncn1
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?