Cc1ccc(-c2cc(C(=O)Nc3ccc(S(=O)(=O)Nc4ncccn4)cc3)[nH]n2)c(O)c1C
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?