InChI=1S/C21H24O9S/c1-4-6-14(22)17-18(24)16-12(7-5-10-28-31(25,26)27)11-15(23)29-19(16)13-8-9-21(2,3)30-20(13)17/h8-9,11,24H,4-7,10H2,1-3H3,(H,25,26,27)