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