C[C@H](CCC(=O)O)[C@H]1CC[C@@H]2[C@H]3CC[C@H]4C[C@H](O)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?