Using BrC(Br)(Br)Br, CCC(O)c1ccc(Cl)c(C(=O)c2ccccc2)c1F to produce CCC(Br)c1ccc(Cl)c(C(=O)c2ccccc2)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.