Using O=S(=O)(c1ccc(Cl)cc1)C(F)(F)F, Oc1ccc(Cl)c(Cl)c1 to produce O=S(=O)(c1ccc(Oc2ccc(Cl)c(Cl)c2)cc1)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.