InChI=1S/C21H20O11S/c1-21(9-30-33(24,25)26)6-5-10-11(32-21)7-13-15(17(10)22)18(23)16-12(27-2)8-14(28-3)19(29-4)20(16)31-13/h5-8,22H,9H2,1-4H3,(H,24,25,26)