Using C[Mg]Br, CC1(C)CCC(N(C(=O)C(C)(C)C=O)[C@H]2CCN(C(=O)OC(C)(C)C)C2)CC1 to produce CC(O)C(C)(C)C(=O)N(C1CCC(C)(C)CC1)C1CCN(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.