COc1cc([C@@H]2Oc3cc4oc(-c5ccccc5)cc(=O)c4c(O)c3O[C@H]2OC)ccc1O
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?