InChI=1S/C22H20O7/c1-24-17-6-12(7-18(25-2)21(17)26-3)19-14-8-16-15(28-10-29-16)5-11(14)4-13-9-27-22(23)20(13)19/h5-8,19H,4,9-10H2,1-3H3/t19-/m1/s1