Using CCCc1cc(C(OCOC)(C(F)(F)F)C(F)(F)F)ccc1O, II to produce CCCc1cc(C(OCOC)(C(F)(F)F)C(F)(F)F)cc(I)c1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.