Using OB(O)c1ccc(C(F)(F)F)nc1, Oc1ccc(-c2ccc(Cl)cc2)nc1Br to produce Oc1ccc(-c2ccc(Cl)cc2)nc1-c1ccc(C(F)(F)F)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.