Using CCCC12CCC(=O)C=C1c1c(cc(OC)c(Cl)c1Cl)C2, O=C1CCC(=O)N1Br to produce CCCC12CCC(=O)C=C1c1c(cc(OC)c(Cl)c1Cl)C2Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.