Nc1ccc(-c2nnc(-c3c(Cl)c(Cl)c(Cl)c(Cl)c3-c3nc4cc(C(=O)c5ccccc5)ccc4[nH]3)o2)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?