InChI=1S/C27H32O17/c28-8-14-16(33)17(34)20(37)26(41-14)42-22-13(32)7-12(31)15(11(30)6-3-9-1-4-10(29)5-2-9)23(22)43-27-21(38)18(35)19(36)24(44-27)25(39)40/h1-7,11,14,16-21,24,26-38H,8H2,(H,39,40)/b6-3+