InChI=1S/C20H18O12S/c21-10-6-12(9-4-2-1-3-5-9)30-13-7-11(22)19(17(24)15(10)13)31-20-18(25)16(23)14(8-29-20)32-33(26,27)28/h1-7,14,16,18,20,22-25H,8H2,(H,26,27,28)