COC(=O)[C@]1(C)N[C@H](CN(C)C(=O)Nc2ccc(Cl)cc2)[C@@H]2C(=O)N(C)C(=O)[C@@H]21.O=C(O)C(F)(F)F
A lower number of pka indicates that the acid dissociates more entirely in water. What is pka of the molecule?