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