CCc1ccc2occ(CC(=O)Nc3c(C(=O)Nc4ccc(Cl)cc4)oc4ccccc34)c2c1
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?