Cc1cccc(C2=NN(c3ccc(Br)cc3)[C@@H](C(=O)N3CCOC3=O)[C@@H]2c2ccccc2)c1
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?