Using CCOC(=O)C(Cc1cccc(SC(F)(F)F)c1)C(O)c1ccc(F)cc1 to produce O=C(O)C(Cc1cccc(SC(F)(F)F)c1)C(O)c1ccc(F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.