Using O=C(c1ccc(Cl)c([N+](=O)[O-])c1)N1CCCCC1, [N-]=[N+]=[N-] to produce O=C(c1ccc2nonc2c1)N1CCCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.