InChI=1S/C20H18O18S/c21-3-7-12-14(38-39(31,32)33)15(18(27)34-7)36-17(26)5-2-8(23)20(30)19(28,29)10(5)9-4(16(25)35-12)1-6(22)11(24)13(9)37-20/h1-2,7,10,12,14-15,18,21-22,24,27-30H,3H2,(H,31,32,33)