InChI=1S/C20H18O9S/c1-11(10-28-30(25,26)27)2-3-12-6-13(4-5-15(12)22)18-9-17(24)20-16(23)7-14(21)8-19(20)29-18/h2,4-9,21-23H,3,10H2,1H3,(H,25,26,27)