InChI=1S/C27H32O17/c1-2-3-6-10-9-5-4-7-11(13(9)26(39)41-10)42-27-20(33)16(29)15(28)12(43-27)8-40-25(38)14(23(34)35)21-18(31)17(30)19(32)22(44-21)24(36)37/h4-7,12,14-22,27-33H,2-3,8H2,1H3,(H,34,35)(H,36,37)/b10-6+