The molecule is a C19-gibberellin differing from gibberellin A3 in the presence of a beta-OH at C-9 (gibbane numbering) (C-15 gibberellin numbering). It is a C19-gibberellin, a gibberellin monocarboxylic acid and a lactone.
(1R,2R,5S,7S,8R,9S,10R,11S,12S)-5,7,12-trihydroxy-11-methyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadec-13-ene-9-carboxylic acid