NC[C@@H]1O[C@@H](O[C@@H]2[C@@H](N)C[C@@H](N)[C@H](O[C@@H]3O[C@@H](CO)[C@H](O)[C@@H](N)[C@@H]3O)[C@H]2O)[C@@H](O)[C@H](O)[C@H]1O
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?