CC(=O)OCC(OC(C)=O)C(OC(C)=O)C(OC(C)=O)C(/C=N\Nc1nc2ccccc2c(=O)[nH]1)=N/Nc1nc2ccccc2c(=O)[nH]1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?