InChI=1S/C21H20O11S/c1-29-14-8-12(23)16-11(22)7-13(10-5-3-2-4-6-10)31-20(16)17(14)21-19(25)18(24)15(9-30-21)32-33(26,27)28/h2-8,15,18-19,21,23-25H,9H2,1H3,(H,26,27,28)