Using CCC(=O)c1cc(C)ccc1C, Br[Mg]c1ccccc1OCc1ccccc1 to produce CCC(O)(c1cc(C)ccc1C)c1ccccc1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.