CCCCCCCCCCCCCCCCCCNc1nc(=O)n(C2CC(OP(=O)(O)OCC3OC(n4cc(F)c(=O)[nH]c4=O)CC3O)C(CO)O2)cc1F
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?