InChI=1S/C27H32O17/c1-2-3-6-11-10-5-4-7-12(16(10)25(38)40-11)41-26-21(35)19(33)22(13(42-26)9-39-15(30)8-14(28)29)43-27-20(34)17(31)18(32)23(44-27)24(36)37/h4-7,13,17-23,26-27,31-35H,2-3,8-9H2,1H3,(H,28,29)(H,36,37)/b11-6+