Using NO, COC(=O)C1=CC(=O)CC(c2ccc(Cl)c(OC)c2F)N1 to produce COC(=O)C1=CC(=NO)CC(c2ccc(Cl)c(OC)c2F)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.