Using O=C1CCC(=O)N1Br, COC(=O)C(C)(Oc1ccc(C)cc1)c1ccccc1 to produce COC(=O)C(C)(Oc1ccc(CBr)cc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.