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