COc1ccc(C2CC(c3c(O)nc4ccc(Cl)cc4c3-c3ccccc3)=NN2S(C)(=O)=O)cc1
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?