InChI=1S/C20H18O8S/c1-11(2)6-7-14-16(21)10-17(22)19-15(9-18(23)27-20(14)19)12-4-3-5-13(8-12)28-29(24,25)26/h3-6,8-10,21-22H,7H2,1-2H3,(H,24,25,26)