InChI=1S/C27H20O11/c28-17-5-1-15(9-19(17)30)12-23(26(33)34)37-25(32)8-4-14-3-7-21-22(11-14)38-27(35)24(36-21)13-16-2-6-18(29)20(31)10-16/h1-11,13,23,28-31H,12H2,(H,33,34)/b8-4+,24-13-