Using Br[Mg]c1ccccc1, O=Cc1cccc(-c2ccccc2)c1OCc1ccccc1 to produce OC(c1ccccc1)c1cccc(-c2ccccc2)c1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.