InChI=1S/C27H28O17/c28-8-14-17(33)18(34)21(37)27(42-14)43-23-15(12(30)7-13(31)16(23)32)11(29)6-3-9-1-4-10(5-2-9)41-26-22(38)19(35)20(36)24(44-26)25(39)40/h1-7,14,17-22,24,26-28,31,33-38H,8H2,(H,39,40)/b6-3+