Using COc1cc(S(=O)(=O)c2ccccc2)ccc1[N+](=O)[O-] to produce O=[N+]([O-])c1ccc(S(=O)(=O)c2ccccc2)cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.