CC(=O)OCC1OC(N2C(c3ccccc3)=CC(c3ccccc3)C(C#N)=C2S)C(OC(C)=O)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?