Using Br[Mg]c1ccccc1, CC(C)C[C@@H]1OC(c2ccc(Br)cc2)OC1=O to produce CC(C)C[C@H](O[C@H](c1ccccc1)c1ccc(Br)cc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.