The molecule is a tetracyclic diterpenoid that is 3b,4,5,5a,6,7,8,9,9a,9b,10,11-dodecahydrophenanthro[1,2-c]furan substituted by methyl groups at positions 3b, 6 and 9 and a carboxy group at position 6. Isolated from Spongia, it exhibits inhibitory activity against androgen receptor. It has a role as a metabolite and an androgen antagonist. It is a tetracyclic diterpenoid, a monocarboxylic acid and a cyclic ether.
(3bR,5aR,6S,9aR,9bR)-3b,6,9a-trimethyl-5,5a,7,8,9,9b,10,11-octahydro-4H-naphtho[2,1-e][2]benzofuran-6-carboxylic acid