InChI=1S/C20H18O9S/c1-20(2,23)16-7-13-15(27-16)9-14(21)18-12(8-17(22)28-19(13)18)10-3-5-11(6-4-10)29-30(24,25)26/h3-6,8-9,16,21,23H,7H2,1-2H3,(H,24,25,26)