InChI=1S/C21H24O9S/c1-11(2)17(23)16-18(24)15-12(6-5-9-28-31(25,26)27)10-14(22)29-19(15)13-7-8-21(3,4)30-20(13)16/h7-8,10-11,24H,5-6,9H2,1-4H3,(H,25,26,27)