Using O=CO, COC(=O)c1ccc(CN)nc1N1CCN(C(=O)OC(C)(C)C)CC1 to produce COC(=O)c1ccc(CNC=O)nc1N1CCN(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.