InChI=1S/C20H18O14S/c21-9-2-1-7(3-10(9)22)18-17(27)16(26)14-11(23)4-8(5-13(14)33-18)32-20-19(34-35(28,29)30)15(25)12(24)6-31-20/h1-5,12,15,19-25,27H,6H2,(H,28,29,30)