InChI=1S/C21H18O10S/c1-10(9-29-32(25,26)27)3-5-12-14(23)8-16-18(19(12)28-2)20-17(21(24)31-16)13-6-4-11(22)7-15(13)30-20/h3-4,6-8,22-23H,5,9H2,1-2H3,(H,25,26,27)