InChI=1S/C21H20O12S/c1-30-15-7-12(23)16-11(22)6-14(9-3-2-4-10(5-9)33-34(27,28)29)32-20(16)17(15)21-19(26)18(25)13(24)8-31-21/h2-7,13,18-19,21,23-26H,8H2,1H3,(H,27,28,29)