Using O=[N+]([O-])c1c(Oc2ccc(Cl)c(-c3ccc(Cl)cc3)c2[N+](=O)[O-])ccc(Cl)c1-c1ccc(Cl)cc1 to produce Nc1cc(Cl)ccc1Oc1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.