Using O=S(=O)(O)O, Nc1cc(C(=O)O)cc([N+](=O)[O-])c1C(=O)c1ccccc1 to produce O=C(O)c1cc(O)c(C(=O)c2ccccc2)c([N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.