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