Using C=C(C)CC(C(F)F)N1C(=O)c2ccccc2C1=O, O=C1CCC(=O)N1Br to produce C=C(CBr)CC(C(F)F)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.