Using COc1ccc2nc(-c3cccc4c3-c3ccccc3C4=O)[nH]c2c1 to produce O=C1c2ccccc2-c2c1cccc2-c1nc2ccc(O)cc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.