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