C[C@H]1[C@H]2[C@H](C[C@H]3[C@@H]4CC=C5C[C@@H](O)[C@H](O)C[C@]5(C)C4CC[C@@]32C)O[C@]12CC[C@@H](C)CO2
A higher negative pKa value denotes a less powerful acid. What is this molecule's negative pKa value?