Using CC(C)(C)OC(=O)N1CC(=O)C1, COc1ccc([Mg]Br)cc1 to produce COc1ccc(C2(O)CN(C(=O)OC(C)(C)C)C2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.