Using NO, Cc1cc(C)n(-c2cnc(C=O)c(Nc3ccc(Cl)cc3)n2)n1 to produce Cc1cc(C)n(-c2cnc(C=NO)c(Nc3ccc(Cl)cc3)n2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.