Using O=C(OCc1ccccc1)c1ccc(O)c(C(=O)OCc2ccccc2)c1, COC(=O)CBr to produce COC(=O)COc1ccc(C(=O)OCc2ccccc2)cc1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.