Using C=C(C)c1ccccc1OCc1ccc(Cl)cc1Cl, O=C1CCC(=O)N1Br to produce C=C(CBr)c1ccccc1OCc1ccc(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.