InChI=1S/C20H24O7/c1-5-11(2)17(22)26-15-9-19(4)6-7-20(24,27-19)13(10-21)8-14-16(15)12(3)18(23)25-14/h5-8,14-16,21,24H,3,9-10H2,1-2,4H3/b11-5+,13-8-/t14-,15-,16+,19?,20?/m1/s1