Using COCCBr, O=C(O)c1cc(CO)cc(S(F)(F)(F)(F)F)c1 to produce COCCOC(=O)c1cc(CO)cc(S(F)(F)(F)(F)F)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.