Using O=S(=O)(OCCC(F)(F)F)C(F)(F)F, COC(=O)c1ccc(O)cc1F to produce O=C(O)c1ccc(OCCC(F)(F)F)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.