C[C@H]1CCC[C@@]2(O1)O[C@@H](CCO)C[C@@H](O)[C@@H]2O
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?