CCN1CCN(Cc2ccc(NC(=O)c3ccc(C)c(NC(=O)c4cc(-c5ccc(Br)cc5)[nH]n4)c3)cc2C(F)(F)F)CC1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?