Using OC(c1nn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)cc1C1CC1(Br)Br)C(F)(F)F to produce O=C(c1nn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)cc1C1CC1(Br)Br)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.