Using Cc1ccc(S(=O)(=O)OCC(F)(F)F)cc1, CCOC(=O)c1ccc(Cl)c(Cl)c1S to produce CCOC(=O)c1ccc(Cl)c(Cl)c1SCC(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.