InChI=1S/C21H24O9S/c1-14(5-8-21(2,12-22)13-29-31(24,25)26)6-9-28-20-15-3-4-19(23)30-18(15)11-17-16(20)7-10-27-17/h3-4,6-7,10-11,22H,5,8-9,12-13H2,1-2H3,(H,24,25,26)/b14-6+