Using COc1ccc2c(C)c(Br)ccc2c1C(F)(F)F, O=C1CCC(=O)N1Br to produce COc1ccc2c(CBr)c(Br)ccc2c1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.