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