Using CCCCCCc1ccc2c(C(=O)Nc3cccc(OCC(=O)OC(C)C)c3)cccc2c1 to produce CCCCCCc1ccc2c(C(=O)Nc3cccc(OCC(=O)O)c3)cccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.