C#CCN1C=CC(=O)[C@@H](OC(=O)Nc2ccccc2Br)[C@H]1c1ccccc1Br
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?