InChI=1S/C20H19O12S/c21-10-3-1-2-9(4-10)18-16(7-12-13(23)5-11(22)6-15(12)30-18)31-20-19(32-33(26,27)28)17(25)14(24)8-29-20/h1-7,14,17,19-25H,8H2,(H,26,27,28)