Using CSc1ccc2c(c1)c(O)nn2Cc1ccc(Cl)c(Cl)c1, O=[N+]([O-])c1ccc(O)c(CCl)c1 to produce CSc1ccc2c(c1)c(=O)n(Cc1cc([N+](=O)[O-])ccc1O)n2Cc1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.