InChI=1S/C29H20O11S/c30-17-12-20(31)25-22(13-17)38-27(16-4-2-1-3-5-16)29(25)24-19(26(33)21(32)14-23(24)39-28(29)34)11-8-15-6-9-18(10-7-15)40-41(35,36)37/h1-14,27,30-33H,(H,35,36,37)/b11-8+