O=C1C2C(C(=O)N1c1ccccc1)C1(Br)c3ccccc3C2(Br)C2C(=O)N(c3ccccc3)C(=O)C21
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?