C19-gibberellin lactone gibberellin A3 Gibberellin A3 gibberellin 3 GA3 Gibberellinsaeure 2beta,7alpha-dihydroxy-1beta-methyl-8-methylidene-13-oxo-4a,1alpha-epoxymethano-4aalpha,4bbeta-gibb-3-ene-10beta-carboxylic acid gibberellic acid 2beta,7alpha-dihydroxy-1beta-methyl-8-methylidene-13-oxo-4a,1alpha-epoxymethano-4aalpha,4bbeta-gibb-3-ene-10beta-carboxylic acid (+)-gibberellic acid A C<small>₁₉</small>-gibberellin that is a pentacyclic diterpenoid responsible for promoting growth and elongation of cells in plants. Initially identified in <em>Gibberella fujikuroi</em>,it differs from gibberellin A<small>₁</small> in the presence of a double bond between C-3 and C-4. Gibberellin (1R,2R,5S,8S,9S,10R,11S,12S)-5,12-dihydroxy-11-methyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.1(5,8).0(1,10).0(2,8)]heptadec-13-ene-9-carboxylic acid gibberellic acid GA3 (1R,2R,5S,8S,9S,10R,11S,12S)-5,12-dihydroxy-11-methyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.1(5,8).0(1,10).0(2,8)]heptadec-13-ene-9-carboxylic acid organic heteropentacyclic compound gibberellin monocarboxylic acid gibberellin A3(1-) mouse metabolite plant metabolite