InChI=1S/C21H24O9S/c1-6-21(5,11-27-31(24,25)26)15-8-13-7-14-9-18(20(3,4)30-12(2)22)28-16(14)10-17(13)29-19(15)23/h6-8,10,18H,1,9,11H2,2-5H3,(H,24,25,26)