Using CC(C)CC[Mg]Br, CC(C)C[C@@H]1NC(=O)O[C@H]1CCC=O to produce CC(C)CCC(=O)CC[C@@H]1OC(=O)N[C@H]1CC(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.