Using COc1cc(OC)cc(C(O)c2ccc(OC)c([N+](=O)[O-])c2)c1 to produce COc1cc(OC)cc(C(=O)c2ccc(OC)c([N+](=O)[O-])c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.