O=C(O)c1ccc2c(c1)C(=O)N([C@H](Cc1ccc(-c3ccccc3)cc1)C(=O)O)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?