Using CCOC(=O)C1CN(C(=O)OC(C)(C)C)CCN1C(=O)OCc1ccccc1 to produce CCOC(=O)C1CN(C(=O)OC(C)(C)C)CCN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.