Using COC(=O)C1(c2cc(C(F)(F)F)cc(C(F)(F)F)c2)CC1 to produce O=C(O)C1(c2cc(C(F)(F)F)cc(C(F)(F)F)c2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.