CC(=O)c1ccc(S(=O)(=O)Nc2cccc(-c3cn4c(n3)SCC4)c2)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?