Using O=C(Nc1ccc(C(O)(C(F)(F)F)C(F)(F)F)cc1)C(F)(F)F to produce OC(c1ccc(NCC(F)(F)F)cc1)(C(F)(F)F)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.