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