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