Using CC(C)(C)OC(=O)N1CCC(N(Cc2ccccc2)C(=O)C2CCN(Cc3ccccc3)C2)CC1, CC[Mg]Br to produce CC(C)(C)OC(=O)N1CCC(N(Cc2ccccc2)C2(C3CCN(Cc4ccccc4)C3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.