Using COC(=O)CC(=O)OC, BrCCCCCCOC(c1ccccc1)(c1ccccc1)c1ccccc1 to produce COC(=O)C(CCCCCCOC(c1ccccc1)(c1ccccc1)c1ccccc1)C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.