InChI=1S/C27H28O17/c1-7-15(31)17(33)20(36)26(40-7)41-9-5-12(30)14-13(6-9)42-22(8-2-3-10(28)11(29)4-8)23(16(14)32)43-27-21(37)18(34)19(35)24(44-27)25(38)39/h2-7,15,17-21,24,26-31,33-37H,1H3,(H,38,39)