Using O=C1c2cccc(O)c2C(=O)c2c(Cl)ccc(Cl)c21, BrCc1ccccc1 to produce O=C1c2cccc(OCc3ccccc3)c2C(=O)c2c(Cl)ccc(Cl)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.