InChI=1S/C20H20F2O4/c1-25-10-12-6-14(24)7-15-16-8-20(21,22)9-17(16)18(26-19(12)15)11-2-4-13(23)5-3-11/h2-7,16-18,23-24H,8-10H2,1H3/t16-,17-,18-/m0/s1