InChI=1S/C31H28O17S/c1-44-30-23(12-45-24(37)7-3-13-2-5-16(33)21(8-13)48-49(41,42)43)47-31(29(40)28(30)39)26-19(36)11-22-25(27(26)38)18(35)10-20(46-22)14-4-6-15(32)17(34)9-14/h2-11,23,28-34,36,38-40H,12H2,1H3,(H,41,42,43)/b7-3+