the affinities for shbg binding of some progestogens including levonorgestrel , norethisterone and the active metabolite of desogestrel , 3-keto-desogestrel , were compared using an equilibrium partition method , and the distribution between free and protein-bound testosterone during progestogen therapy was calculated with the use of a computer program .
C0057558
desogestrel
C0047683
3-keto-desogestrel