InChI=1S/C20H18O9S/c1-10(8-27-30(23,24)25)15-5-11-4-13-17(7-16(11)28-15)26-9-20(22)14-3-2-12(21)6-18(14)29-19(13)20/h2-4,6-7,15,19,21-22H,1,5,8-9H2,(H,23,24,25)