Using COc1cccc(-c2ocnc2-c2onc(-c3ccccc3)c2-c2ccccc2)c1 to produce Oc1cccc(-c2ocnc2-c2onc(-c3ccccc3)c2-c2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.