(1S,3aS,3bR,8aR,8bS,10aS)-8a,10a-dimethyl-7-oxo-1,2,3,3a,3b,4,5,7,8,8a,8b,9,10,10a-tetradecahydrodicyclopenta[a,f]naphthalen-1-yl propanoate