Using COC(=O)C(CN1C(=O)c2ccccc2C1=O)(C(=O)OC)N1CCN(C(=O)OC(C)(C)C)CC1 to produce COC(=O)C(CN)(C(=O)OC)N1CCN(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.