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