The molecule is a tetracyclic triterpenoid that is 5alpha-lanosta-8-ene with an epoxy group across positions 24 and 25, a hydroxy group at position 26 and oxo groups at positions 3 and 7. Isolated from the fruiting bodies of Ganoderma pfeifferi, it exhibits antiviral activity against influenza A virus. It has a role as a metabolite and an EC 3.2.1.18 (exo-alpha-sialidase) inhibitor. It is a diketone, a primary alcohol, a tetracyclic triterpenoid and an epoxide. It derives from a hydride of a lanostane.
(5R,10S,13R,14R,17R)-17-[(2R)-4-[3-(hydroxymethyl)-3-methyloxiran-2-yl]butan-2-yl]-4,4,10,13,14-pentamethyl-2,5,6,11,12,15,16,17-octahydro-1H-cyclopenta[a]phenanthrene-3,7-dione