Using COC(=O)c1ccc(-c2nc(-c3ccc(Oc4ccccc4)cc3)no2)cc1 to produce O=C(O)c1ccc(-c2nc(-c3ccc(Oc4ccccc4)cc3)no2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.