CC[C@H](C)[C@@H]1NC(=O)c2cc([N+](=O)[O-])cc(F)c2OCC[C@@H](C(N)=O)NC(=O)[C@H](CCCCN)NC1=O
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?