InChI=1S/C29H20O11S/c30-18-12-17(7-6-15-4-2-1-3-5-15)23-21(13-18)39-28(34)29(23)24-22(14-20(31)25(32)26(24)33)38-27(29)16-8-10-19(11-9-16)40-41(35,36)37/h1-14,27,30-33H,(H,35,36,37)/b7-6+