Using O=C(CC(=O)C(F)(F)F)c1c(O)c2nccnc2[nH]c1=O, NO to produce O=C(CC(=NO)C(F)(F)F)c1c(O)c2nccnc2[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.