InChI=1S/C20H22O9S/c1-27-20-9-12-3-2-4-14(21)16(23)11-18(29-30(24,25)26)13-6-7-15(22)19(10-13)28-17(20)8-5-12/h5-10,14,18,21-22H,2-4,11H2,1H3,(H,24,25,26)