InChI=1S/C20H18O13S/c21-8-2-1-7(3-9(8)22)14-5-12(25)15-10(23)4-11(24)16(18(15)32-14)19-20(33-34(28,29)30)17(27)13(26)6-31-19/h1-5,13,17,19-24,26-27H,6H2,(H,28,29,30)