InChI=1S/C20H28O7/c1-2-3-5-10-14(11-13-8-6-4-7-9-13)12-26-20-17(23)15(21)16(22)18(27-20)19(24)25/h4,6-9,11,15-18,20-23H,2-3,5,10,12H2,1H3,(H,24,25)/b14-11-