InChI=1S/C20H28O8/c1-12(6-5-9-14(11-21)10-13-7-3-2-4-8-13)27-20-17(24)15(22)16(23)18(28-20)19(25)26/h2-4,7-8,10,12,15-18,20-24H,5-6,9,11H2,1H3,(H,25,26)/b14-10-