O=C1c2cccc(O)c2C(=O)c2c(O[C@@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]3O)cccc21
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?