COC(=O)[C@]1(Cc2ccccc2)N[C@H](CN(C)C(=O)Nc2ccc(OC)cc2)[C@@H]2C(=O)N(Cc3ccccc3)C(=O)[C@@H]21.O=C(O)C(F)(F)F
A higher negative pKa value denotes a less powerful acid. What is this molecule's negative pKa value?