InChI=1S/C27H22O12/c28-17-5-1-15(10-19(17)30)12-23(26(34)35)38-22-7-3-14(9-21(22)32)4-8-25(33)39-24(27(36)37)13-16-2-6-18(29)20(31)11-16/h1-12,24,28-32H,13H2,(H,34,35)(H,36,37)/b8-4+,23-12-