Using CCOC(=O)CCC(Oc1ccccc1C)C(=O)OCC, O=C1CCC(=O)N1Br to produce CCOC(=O)CCC(Oc1ccccc1CBr)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.