Using CCCn1nc(-c2ccc(OC)cc2)c2cccc(-c3ccc(OC)cc3)c21 to produce CCCn1nc(-c2ccc(O)cc2)c2cccc(-c3ccc(O)cc3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.