InChI=1S/C20H20O10S/c1-10(9-29-31(25,26)27)3-5-12-14(22)8-15(23)17(19(12)28-2)20-18(24)13-6-4-11(21)7-16(13)30-20/h3-4,6-8,20-23H,5,9H2,1-2H3,(H,25,26,27)