InChI=1S/C20H22O9S/c1-27-18-10-12-4-2-3-5-15(22)20(29-30(24,25)26)19(23)13-7-8-14(21)17(11-13)28-16(18)9-6-12/h6-11,19-21,23H,2-5H2,1H3,(H,24,25,26)