InChI=1S/C29H20O12S/c30-17-6-4-15(5-7-17)27-29(26-21(34)11-19(32)13-24(26)39-27)25-16(10-18(31)12-23(25)40-28(29)35)3-1-14-2-8-20(33)22(9-14)41-42(36,37)38/h1-13,27,30-34H,(H,36,37,38)/b3-1+