C=C[C@H]1CC[C@H]2[C@@H]3CC=C4C[C@@H](OC5OCC(O)C(O)C5O)CC[C@]4(C)[C@H]3CC[C@@]21C
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?