Isolation and Characterization of Gibberellins inCalonyction aculeatumand Structures of Gibberellins A30, A31, A33and A34

Four novel gibberellins GA30, GA31, GA33, GA34, five known gibberellins GA8, GA17 (free acid and its monomethyl ester), GA19, GA27, GA29 and the gibberellin-like substances were isolated from immature seeds of evening-glory (Calonyction aculeatum). The structures of GA30, GA31, GA33 and GA34 were elucidated as IX, XVIII, XXII and XXXIV, respectively. The three gibberellin-like substances were partially characterized.