InChI=1S/C20H16O9S/c1-20(10-27-30(24,25)26)8-7-12-14(29-20)9-13(21)15-16(22)17(23)18(28-19(12)15)11-5-3-2-4-6-11/h2-9,21,23H,10H2,1H3,(H,24,25,26)