InChI=1S/C21H20O8S/c1-21(13-22)12-11-17-19(28-21)10-6-15(20(17)27-2)5-9-18(23)14-3-7-16(8-4-14)29-30(24,25)26/h3-12,22H,13H2,1-2H3,(H,24,25,26)