Using CC12CCC3c4ccc(OCc5ccccc5)cc4CCC3C1Cc1c2n[nH]c1CO to produce CC12CCC3c4ccc(O)cc4CCC3C1Cc1c2n[nH]c1CO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.