Using O=C([O-])CCC(=O)OCc1ccccc1, CC(C)(C)OC(=O)CCCCl to produce CC(C)(C)OC(=O)CCCOC(=O)CCC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.