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