Using O=C1C2=C(CCCC2)C(=O)N1c1ccc(Cl)c([N+](=O)[O-])c1 to produce Nc1cc(N2C(=O)C3=C(CCCC3)C2=O)ccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.