Using O=C1CCC(=O)N1Br, COC(=O)c1cc(Br)c(=O)n([C@@H](C)c2ccccc2)c1C to produce COC(=O)c1cc(Br)c(=O)n([C@@H](C)c2ccccc2)c1CBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.