Using O=C1NC(=O)c2cc(Nc3ccc([N+](=O)[O-])cc3)c(Nc3ccc([N+](=O)[O-])cc3)cc21 to produce Nc1ccc(Nc2cc3c(cc2Nc2ccc(N)cc2)C(=O)NC3=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.