CN1C(=O)[C@@H](NC(=O)C(C)(C)C)N=C(c2ccccc2)c2ccccc21
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?