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