Using O=C1CCC(=O)N1Br, COC(=O)c1cc(C)sc1N1C(=O)c2ccccc2C1=O to produce COC(=O)c1cc(CBr)sc1N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.