Using CCCc1cccc2c(/C=C(/C)C(=O)OCC)cc(OC)c(OCOC)c12 to produce CCCc1cccc2c(/C=C(/C)C(=O)O)cc(OC)c(OCOC)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.