InChI=1S/C29H20O11S/c30-18-7-5-16(6-8-18)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)4-1-15-2-9-21(10-3-15)40-41(35,36)37/h1-14,27,30-33H,(H,35,36,37)/b4-1+