InChI=1S/C20H28O8/c21-12-14(11-13-7-3-1-4-8-13)9-5-2-6-10-27-20-17(24)15(22)16(23)18(28-20)19(25)26/h1,3-4,7-8,11,15-18,20-24H,2,5-6,9-10,12H2,(H,25,26)/b14-11-