Using Nc1ccc(OC(F)(F)F)cc1, O=C(O)CCC(=O)c1cccc(F)c1 to produce O=C(CCC(=O)c1cccc(F)c1)Nc1ccc(OC(F)(F)F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.