Using C=CCC[Mg]Br, CC(C)(C)OC(=O)N1C(=O)CC[C@H]1C(=O)OCc1ccccc1 to produce C=CCCC(=O)CC[C@H](NC(=O)OC(C)(C)C)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.