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