COc1cc(OC2OC(CO)C(O)C(O)C2O)c2c(c1)O[C@@H]1[C@H](O)Oc3cc(OC)c(OC)cc3[C@]1(O)C2=O
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?