InChI=1S/C20H28O8/c1-2-3-9-14(13(11-21)10-12-7-5-4-6-8-12)27-20-17(24)15(22)16(23)18(28-20)19(25)26/h4-8,10,14-18,20-24H,2-3,9,11H2,1H3,(H,25,26)