Using O=C1CCC(=O)N1Br, COC(=O)c1c(C)c(=O)c2ccc(Cl)cc2n1-c1ccccc1 to produce COC(=O)c1c(CBr)c(=O)c2ccc(Cl)cc2n1-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.