InChI=1S/C29H26O9/c1-14-10-20(18-6-5-17(31)13-25(18)35)26(29(37)38)21(11-14)27-23(33)9-7-19(28(27)36)22(32)8-3-15-2-4-16(30)12-24(15)34/h2-9,11-13,20-21,26,30-31,33-36H,10H2,1H3,(H,37,38)/b8-3+