InChI=1S/C21H24O9S/c1-28-17-5-3-4-14(10-17)6-8-16(22)13-19(24)18(23)11-15-7-9-20(21(12-15)29-2)30-31(25,26)27/h3-5,7,9-10,12,18,23H,6,8,11,13H2,1-2H3,(H,25,26,27)