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