InChI=1S/C21H24O9S/c1-13(18(30-31(24,25)26)11-21(2,3)12-22)6-8-28-20-14-4-5-19(23)29-17(14)10-16-15(20)7-9-27-16/h4-7,9-10,18,22H,8,11-12H2,1-3H3,(H,24,25,26)/b13-6+