Using CON(C)C(=O)CC(c1ccc(Br)cc1)c1ccccc1C, COc1ccc(Br)cc1 to produce COc1ccc(C(=O)CC(c2ccc(Br)cc2)c2ccccc2C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.