relative binding affinities ( rba ) for the androgen receptor were estimated for levonorgestrel , progesterone , dihydrotestosterone , cyproterone acetate , 17 alpha-propylmesterolone and 3-keto-desogestrel ( 13-ethinyl-11-methylene-18,19-dinor-17 alpha-pregn-4-en-20-yn-17-ol-3-one ) which is the biological active metabolite of desogestrel .
C0047683
3-keto-desogestrel
C0057558
desogestrel