The molecule is a gibberellin norketone in which the =O of the keto function in gibberellin A3 is replaced by a =CH2 methylidene group. It derives from a gibberellin A3.
(1R,2R,5S,8R,9S,10R,11S,12S)-5,12-dihydroxy-11-methyl-6,16-dioxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadec-13-ene-9-carboxylic acid