Using O=C(O)c1ccc(-c2nc3ccc([N+](=O)[O-])c([N+](=O)[O-])c3[nH]2)cc1 to produce Nc1cc2nc(-c3ccc(C(=O)O)cc3)[nH]c2cc1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.