Using CCCCC(=O)c1c(-c2ccc3cc(OCC(=O)OCC)ccc3c2)oc2ccccc12 to produce CCCCC(=O)c1c(-c2ccc3cc(OCC(=O)O)ccc3c2)oc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.