CC(=O)Nc1ccc(S(=O)(=O)Nc2nc(-c3ccc(Cl)cc3)cc(N3N=C(c4ccc(Br)cc4)CC3c3ccccc3)n2)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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?