Using O=C([O-])[O-], O=c1[nH]c2ccc(Cl)cc2c(-c2ccccc2)[n+]1[O-] to produce Cn1c(=O)[n+]([O-])c(-c2ccccc2)c2cc(Cl)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.