InChI=1S/C21H20O14S/c1-7-15(24)17(26)19(28)21(32-7)33-9-5-11(23)14-13(6-9)34-20(18(27)16(14)25)8-2-3-10(22)12(4-8)35-36(29,30)31/h2-7,15,17,19,21-24,26-28H,1H3,(H,29,30,31)