COc1cccc(NS(=O)(=O)c2ccc3c(c2)[C@H]2C=CC[C@H]2[C@@H](c2ccccc2Cl)N3)c1
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?