InChI=1S/C20H12O10S/c1-9(12-8-14(22)10-4-2-6-13(21)16(10)19(12)24)18(23)17-11(20(25)26)5-3-7-15(17)30-31(27,28)29/h2-8,21H,1H2,(H,25,26)(H,27,28,29)