Using O=[N+]([O-])c1cc2c(Nc3ccc(Cl)c(Cl)c3)ncnc2cc1Cl to produce Nc1cc2c(Nc3ccc(Cl)c(Cl)c3)ncnc2cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.