COC(=O)C1CCN(C2=C(NS(=O)(=O)c3ccc(Cl)cc3)C(=O)c3ccccc3C2=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?