InChI=1S/C20H20O8S/c1-12(2)3-9-15-17(22)11-18(23)19(20(15)24)16(21)10-6-13-4-7-14(8-5-13)28-29(25,26)27/h3-8,10-11,22-24H,9H2,1-2H3,(H,25,26,27)