CC(=O)Nc1ccc2c3c(cc(O)c2c1)N(C(=O)CCCCC(=O)N1CC(CCl)c2c1cc(O)c1cc(NC(C)=O)ccc21)CC3CCl
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?