Using O=S(=O)(OCC(F)(F)F)C(F)(F)F, O=C(CC(=O)OCc1ccccc1)OCc1ccccc1 to produce O=C(OCc1ccccc1)C(CC(F)(F)F)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.