抄録
The outline of this report has already been published in this journal as Communication to the Editors1, 2). It was shown that gibberellin A3 (gibberellic acid) has one more double bond at certain position of the gibberellin A1 structure. Several experiments supporting the partial structure of gibberellin A3 as (I) are reported. The position of the double bond in ring A of gibberellin A3 was assigned and the final structure of gibberellin A3 is reported.
