Using COc1cc2c(Oc3cc4cnccc4nc3C)ccnc2cc1OCc1ccccc1 to produce COc1cc2c(Oc3cc4cnccc4nc3C)ccnc2cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.