InChI=1S/C20H18O8S/c1-12(11-27-29(24,25)26)7-8-14-16(21)10-17(22)19-15(9-18(23)28-20(14)19)13-5-3-2-4-6-13/h2-7,9-10,21-22H,8,11H2,1H3,(H,24,25,26)