Using Cc1oc(-c2ccccc2)cc1C=O, Br[Mg]C1CCC2(CC1)OCCO2 to produce Cc1oc(-c2ccccc2)cc1C(O)C1CCC2(CC1)OCCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.