InChI=1S/C21H20O11S/c1-9(8-30-33(27,28)29)4-5-12-11(3)18-15(7-13(12)22)31-19-16(21(26)32-18)10(2)6-14(23)17(19)20(24)25/h4,6-7,22-23H,5,8H2,1-3H3,(H,24,25)(H,27,28,29)