C=C[C@@]1(C)CC(=O)[C@]2(O)[C@](C)(O1)[C@@H](OC(C)=O)[C@@H](O)[C@H]1C(C)(C)CC[C@H](O)[C@@]12C
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?