Using CCOC(=O)Cc1ccccc1, O=C(O)CCCCNC(=O)OCc1ccccc1 to produce CCOC(=O)C(C(=O)CCCCNC(=O)OCc1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.