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