Using OCc1cc(F)ccc1OC(F)(F)c1ccc(-c2ccc(C(F)(F)F)cc2)cc1, BrC(Br)(Br)Br to produce Fc1ccc(OC(F)(F)c2ccc(-c3ccc(C(F)(F)F)cc3)cc2)c(CBr)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.