InChI=1S/C29H20O12S/c30-17-6-3-14(21(33)10-17)1-2-16-9-18(31)12-23-25(16)29(28(35)40-23)26-22(34)11-19(32)13-24(26)39-27(29)15-4-7-20(8-5-15)41-42(36,37)38/h1-13,27,30-34H,(H,36,37,38)/b2-1+