Using CCCCC12CCC(=O)C=C1c1ccc(OC)c(Cl)c1C2, BrBr to produce CCCCC12CCC(=O)C(Br)=C1c1ccc(OC)c(Cl)c1C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.