Using COC(=O)c1cccc2oc(-c3ccc4ccccc4c3OCc3ccccc3)nc12 to produce COC(=O)c1cccc2oc(-c3ccc4ccccc4c3O)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.