Using BrCc1ccccc1, O=C(O)c1cc(-c2ccc(F)cc2F)ccc1O to produce O=C(OCc1ccccc1)c1cc(-c2ccc(F)cc2F)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.