Using OB(O)c1ccccc1C(F)(F)F, CC(C)(C)c1ccc(Nc2nncc3cc(Br)ccc23)cc1 to produce CC(C)(C)c1ccc(Nc2nncc3cc(-c4ccccc4C(F)(F)F)ccc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.