Using CCCCc1oc2ccccc2c1-c1ncc(-c2ccc3cc(OCC(=O)OC)ccc3c2)o1 to produce CCCCc1oc2ccccc2c1-c1ncc(-c2ccc3cc(OCC(=O)O)ccc3c2)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.