Using COC(=O)c1cccc(C)c1O, O=S(=O)(O)C(F)(F)F to produce COC(=O)c1cccc(C)c1OS(=O)(=O)C(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.