Using OB(O)c1ccc(Cl)cc1Cl, O=c1cc(OS(=O)(=O)C(F)(F)F)c2ccc(Br)cc2o1 to produce O=c1cc(-c2ccc(Cl)cc2Cl)c2ccc(Br)cc2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.