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