InChI=1S/C27H38O8/c1-2-3-4-9-15-20-21(34-20)16-10-7-5-6-8-12-18-13-11-14-19(17-18)33-27-24(30)22(28)23(29)25(35-27)26(31)32/h2,4,9,11,13-14,17,20-25,27-30H,1,3,5-8,10,12,15-16H2,(H,31,32)/b9-4+