CSc1nc(NC2OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C2OC(C)=O)c2c(OC(C)=O)c(C)c(=O)oc2n1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?