O=c1cc(-c2cc(O)c(O)c([C@@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@H]3O)c2)oc2cc(O[C@@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@H]3O)cc(O)c12
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?