InChI=1S/C23H14O7/c1-29-22-13(24)8-7-11-16(22)20(27)15-12(19(11)26)9-14(25)17-18(15)21(30-23(17)28)10-5-3-2-4-6-10/h2-9,21,24-25H,1H3/t21-/m1/s1