InChI=1S/C23H20O11/c1-32-22-16(28)4-10(5-17(22)29)23(31)34-19-8-12-13(25)6-11(24)7-18(12)33-21(19)9-2-14(26)20(30)15(27)3-9/h2-7,19,21,24-30H,8H2,1H3/t19-,21-/m1/s1