The molecule is an alkyl-gibberellin that is gibberellin A1 carrying an extra methyl substituent at position 2beta (3beta using gibbane skeletal numbering).
(1R,2R,5S,8S,9S,10R,11S,12S,13S)-5,12-dihydroxy-11,13-dimethyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadecane-9-carboxylic acid