C[C@@]12C(=O)Nc3cc(Cl)ccc3C(=O)N1[C@H]1c3cc(Br)ccc3OC[C@@H]1[C@@H]2c1ccccc1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?