Using COC(=O)CC(=O)OC, CC(=O)OCC1=CCN(C(=O)OC(C)(C)C)C1 to produce COC(=O)C(CC1=CCN(C(=O)OC(C)(C)C)C1)C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.