CCC(=O)Nc1cccc(C2=NOC3(C2)C[C@@H](C(N)=O)N(C(=O)c2cc([N+](=O)[O-])cc([N+](=O)[O-])c2C)C3)c1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?