Using COC(=O)CC(=O)OCc1ccccc1, COC1(c2cccc(CBr)c2)CCOCC1 to produce COC(=O)C(Cc1cccc(C2(OC)CCOCC2)c1)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.