InChI=1S/C20H20O18S/c21-3-7-13-15(38-39(31,32)33)16(20(30)34-7)37-18(28)5-1-6(22)11(24)12(25)9(5)10-4(17(26)27)2-8(23)35-14(10)19(29)36-13/h1,4,7,10,13-16,20-22,24-25,30H,2-3H2,(H,26,27)(H,31,32,33)