COc1ccc2c(c1)O[C@@H](c1cccc(C(F)(F)F)c1)[C@H](OC(=O)Nc1ccc(C)c(Br)c1)C2=O
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?