Using O=C(O)c1ccccc1Oc1cc(Cl)ccc1[N+](=O)[O-] to produce O=c1c2ccccc2oc2c([N+](=O)[O-])ccc(Cl)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.