CC(=O)OCC1OC(NC(=S)N/N=C2\CC(c3ccccc3)Oc3ccccc32)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?