Using CC[Mg]Br, CC(C)(C)OC(=O)N1CCC(=O)c2ccccc21 to produce CCC1(O)CCN(C(=O)OC(C)(C)C)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.