Using CCCCCc1ccc(-c2cc(OC)c(-c3ccc(CCCCC)cc3)cc2OC)cc1 to produce CCCCCc1ccc(-c2cc(O)c(-c3ccc(CCCCC)cc3)cc2O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.