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