InChI=1/C21H24F4O2/c1-14-6-5-7-15(10-14)12-20(26,21(23,24)25)13-19(2,3)17-11-16(22)8-9-18(17)27-4/h5-11,26H,12-13H2,1-4H3/t20-/m1/s1 8BF8021E7F4BFAB9