Using COc1ccc(C(=O)c2cc(C(=O)c3ccc(OC)cc3)cc([N+](=O)[O-])c2)cc1 to produce O=C(c1ccc(O)cc1)c1cc(C(=O)c2ccc(O)cc2)cc([N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.