InChI=1S/C20H18O9S/c1-19(9-27-30(23,24)25)5-4-11-6-13-16(8-15(11)29-19)26-10-20(22)14-3-2-12(21)7-17(14)28-18(13)20/h2-8,18,21-22H,9-10H2,1H3,(H,23,24,25)