The molecule is an abietane diterpenoid that is ent-abieta-2(3),13(15)-diene-16,12-olide substituted by beta-acetoxy groups at positions 1 and 7 and a beta-epoxy group across positions 8 and 14. Isolated from the leaves of Gelonium aequoreum, it exhibits moderate cytotoxicity against lung (A549), breast (MDAMB-231 and MCF7), and liver (HepG2) cancer cell lines. It has a role as a metabolite and an antineoplastic agent. It is a gamma-lactone, an abietane diterpenoid, an acetate ester, an epoxide and an organic heteropentacyclic compound.
[(1R,3R,8R,10S,11R,12R,16R,18S)-12-acetyloxy-5,11,15,15-tetramethyl-6-oxo-2,7-dioxapentacyclo[8.8.0.01,3.04,8.011,16]octadeca-4,13-dien-18-yl] acetate