CCOC(=O)c1cc2c3c(c(O)c(OC)c2s1)N(C(=O)c1cc2c4c(c(O)c(OC)c2s1)N(C(C)=O)CC4)CC3
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?