Using O=C([O-])[O-], CCCCc1c(C(=O)OCC)cc(O)c2ccccc12 to produce CCCCc1c(C(=O)OCC)cc(OC)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.