Using COc1cc(C(O)c2nc3ccccc3[nH]2)cc([N+](=O)[O-])c1OC to produce COc1cc(C(=O)c2nc3ccccc3[nH]2)cc([N+](=O)[O-])c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.