Using CCOC(=O)C(=O)OCC, CC(=O)CCN1C(=O)c2ccccc2C1=O to produce CCOC(=O)C(=O)CC(=O)CCN1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.