Using C=Cc1cnc2c(NCCCO)nc3cc(C(F)(F)F)ccc3n12, C[N+]1([O-])CCOCC1 to produce O=Cc1cnc2c(NCCCO)nc3cc(C(F)(F)F)ccc3n12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.