InChI=1S/C20H18O11S/c21-7-12(22)20(27)5-4-8-10(6-20)18(25)14-15(16(8)23)19(26)13-9(17(14)24)2-1-3-11(13)31-32(28,29)30/h1-3,12,21-23,25,27H,4-7H2,(H,28,29,30)/t12?,20-/m1/s1