InChI=1S/C29H20O11S/c30-18-8-6-16(7-9-18)27-29(26-22(33)12-20(32)14-24(26)38-27)25-17(11-19(31)13-23(25)39-28(29)34)5-4-15-2-1-3-21(10-15)40-41(35,36)37/h1-14,27,30-33H,(H,35,36,37)/b5-4+