The molecule is a tetracyclic triterpenoid that is A,B-dihomo-19-nor-4-oxalanosta-1,8,19,24-tetraen-26,22-olide substituted by an acetoxy group at position 15, a hydroxy group at position 23 and an oxo group at position 3 (the 22S, 23R stereoisomer). It is isolated from the fruiting bodies of the Vietnamese mushroom Ganoderma colossum and displays inhibitory activity towards the enzyme HIV protease. It has a role as a metabolite and a HIV protease inhibitor. It is a delta-lactone, an acetate ester, an epsilon-lactone, a tetracyclic triterpenoid and a secondary alcohol. It derives from a hydride of a lanostane.
[(9R,13R,14R,16R,17R)-16-[(1S)-1-[(2S,3R)-3-hydroxy-5-methyl-6-oxo-2,3-dihydropyran-2-yl]ethyl]-8,8,13,17-tetramethyl-6-oxo-7-oxatetracyclo[10.7.0.03,9.013,17]nonadeca-1(12),2,4-trien-14-yl] acetate