Using O=C1CCC(=O)N1Br, CON=C(CCC1CCCC1)c1ccc(Cl)cc1 to produce CON=C(c1ccc(Cl)cc1)C(Br)CC1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.