Using O=C(OC(=O)C(F)(F)F)C(F)(F)F, CCCC(O)c1ccc(OCc2ccsc2C(=O)O)cc1 to produce O=C1c2cc(CCCCOC(=O)C(F)(F)F)ccc2OCc2ccsc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.