InChI=1S/C22H18O9/c23-12-3-1-10(2-4-12)21-19(9-14-15(25)7-13(24)8-18(14)30-21)31-22(29)11-5-16(26)20(28)17(27)6-11/h1-8,19,21,23-28H,9H2/t19-,21-/m1/s1