COC(=O)C([C@H]1CC[C@H](OCc2ccccc2)[C@@]1(O)COCc1ccccc1)C(C)(O)CCc1ccccc1
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?