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