Using CCCCCCc1cc(-c2cccc(C=CC(=O)OC)c2)ccc1OC to produce CCCCCCc1cc(-c2cccc(C=CC(=O)O)c2)ccc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.