InChI=1S/C21H24O9S/c1-10(2)17(23)16-18(24)15-12(8-11(3)30-31(25,26)27)9-14(22)28-19(15)13-6-7-21(4,5)29-20(13)16/h6-7,9-11,24H,8H2,1-5H3,(H,25,26,27)