InChI=1S/C23H18O9/c1-29-16-6-10(2-4-13(16)26)21-18(9-24)32-23-15(30-21)5-3-12-20(28)19-14(27)7-11(25)8-17(19)31-22(12)23/h2-8,18,21,24-27H,9H2,1H3/t18-,21-/m1/s1