Using O=C(c1ccccn1)c1[nH]c2cc(Cl)ccc2c1[N+](=O)[O-] to produce Nc1c(C(=O)c2ccccn2)[nH]c2cc(Cl)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.