InChI=1S/C29H20O10S/c30-19-12-18(9-6-16-7-10-21(11-8-16)39-40(34,35)36)25-23(14-19)38-28(33)29(25)26-22(32)13-20(31)15-24(26)37-27(29)17-4-2-1-3-5-17/h1-15,27,30-32H,(H,34,35,36)/b9-6+