CCN1C(=O)[C@H]2CC[C@H]3/C(=N\O[C@@H]4O[C@@H](COC(C)=O)[C@@H](OC(C)=O)[C@@H](OC(C)=O)[C@H]4OC(C)=O)C[C@@H](O)[C@@H](O)[C@@H]3[C@@H]2C1=O
A higher negative pKa value denotes a less powerful acid. What is this molecule's negative pKa value?