InChI=1S/C27H24O9/c28-9-1-2-15-3-7-20-22(10-15)36-27(24(13-29)33-20)17-5-8-21-23(12-17)34-25(14-30)26(35-21)16-4-6-18(31)19(32)11-16/h1-12,24-27,29-32H,13-14H2/b2-1+