InChI=1S/C27H30O13/c1-35-17-10-13(5-6-16(17)38-27-22(32)20(30)21(31)25(40-27)26(33)34)23-15(11-28)14-8-12(4-7-19(29)37-3)9-18(36-2)24(14)39-23/h4-10,15,20-23,25,27-28,30-32H,11H2,1-3H3,(H,33,34)/b7-4+