CC(=O)O[C@H]1C(=O)[C@@]2(C)C([C@H](OC(=O)c3ccccc3)[C@]3(O)C[C@H](O)C(C)=C1C3(C)C)[C@]1(OC(C)=O)CO[C@@H]1C[C@H]2O
A higher negative pKa value denotes a less powerful acid. What is this molecule's negative pKa value?