Using CON(C)C(=O)c1ccc2c(c1)CCN(C(=O)OC(C)(C)C)C2, C[Mg]Br to produce CC(=O)c1ccc2c(c1)CCN(C(=O)OC(C)(C)C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.