COC(=O)[C@@H]1C[C@@]2(O)[C@@H](O)[C@@H](O)[C@@H](O)C[C@H]2N1Cc1ccc(C(C)(C)C)cc1
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?