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