O=c1[nH]c(=O)n([C@@H]2C[C@H](O)[C@H](CO)C2)cc1I
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?