InChI=1S/C20H19O13S/c21-9-4-12(23)10-6-16(18(31-15(10)5-9)8-1-2-11(22)13(24)3-8)32-20-17(26)19(14(25)7-30-20)33-34(27,28)29/h1-6,14,17,19-26H,7H2,(H,27,28,29)