Using O=S(=O)([O-])C(F)(F)C(F)(F)C(F)(F)C(F)(F)F to produce O=S(=O)(O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.