Using Br[Mg]c1ccccc1, O=C(c1ccc(F)cc1)c1ccc(F)cc1 to produce OC(c1ccccc1)(c1ccc(F)cc1)c1ccc(F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.