C[C@H](CCC(=O)NCCS(=O)(=O)[O-])[C@H]1CC[C@H]2[C@H]3[C@H](CC[C@@]21C)[C@@]1(C)CC[C@@H](O)C[C@H]1C[C@H]3O.[Na+]
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?