Using O=C(NCc1ccc(F)c([N+](=O)[O-])c1)C1(C(F)(F)F)CC1 to produce Nc1cc(CNC(=O)C2(C(F)(F)F)CC2)ccc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.