InChI=1S/C27H30O17/c1-7-15(31)17(33)20(36)26(40-7)43-23-16(32)14-12(30)5-9(41-27-21(37)18(34)19(35)24(44-27)25(38)39)6-13(14)42-22(23)8-2-3-10(28)11(29)4-8/h2-7,15,17-24,26-31,33-37H,1H3,(H,38,39)