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