InChI=1S/C20H20O11S/c1-6(5-30-32(27,28)29)9-14(22)11-12(17(25)15(9)23)20(3)4-8(21)10-7(2)19(26)31-18(13(10)20)16(11)24/h6,8,21-23,25H,4-5H2,1-3H3,(H,27,28,29)