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