InChI=1S/C29H20O12S/c30-17-7-2-14(3-8-17)1-4-16-11-18(31)12-21-23(16)29(28(35)40-21)24-22(13-20(32)25(33)26(24)34)39-27(29)15-5-9-19(10-6-15)41-42(36,37)38/h1-13,27,30-34H,(H,36,37,38)/b4-1+