CCCCCCCCCCCCCCCC(=O)OCC1OC(N2C(=O)/C(=N\NC(N)=S)c3ccc([N+](=O)[O-])cc32)C(OC(C)=O)C1OC(C)=O
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?