Using FC(F)(F)c1cc(-c2ccc(Cl)cc2)[nH]c1C(F)(F)F, BrBr to produce FC(F)(F)c1[nH]c(-c2ccc(Cl)cc2)c(Br)c1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.