The Structure of Gibberellin A23 and the Biological Properties of 3, 13-Dihydroxy C20-Gibberellins

Two aldehydic C20-gibberellins, L-2 and L-4, were isolated from the immature fruits of yellow lupine (Lupinus luteus L.). L-2 was shown to have the structure II and named gibberellin A23. L-4 was identified as gibberellin A19 (VI). Two new C20-gibberellins, tentatively called 3, 13-dihydroxy GA15 (IV) and 13-hydroxy GA15 (VIII), were derived from gibberellins, A23 and A19, respectively. The biological activities of four 3, 13-dihydroxy C20-gibberellins-GA18 (I), GA23 (II), GA28 (III) and 3, 13-dihydroxy GA15(IV), which were isolated from the fruits except for 3, 13-dihydroxy GA15-were compared in six gibberellin bioassays.