(1beta,11beta,12alpha,15alpha)-1,11,12,14,15-pentahydroxy-11,20-epoxypicras-3-ene-2,16-dione Iandonone InChI=1/C20H26O9/c1-7-4-10(21)13(23)17(3)9(7)5-11-18-6-28-20(27,16(17)18)12(22)8(2)19(18,26)14(24)15(25)29-11/h4,8-9,11-14,16,22-24,26-27H,5-6H2,1-3H3/t8-,9-,11+,12+,13+,14+,16+,17+,18+,19-,20-/m0/s picras-3-ene-2,16-dione, 11,20-epoxy-1,11,12,14,15-pentahydroxy-, (1beta,11beta,12alpha,15alpha)-