in a cross-over study with orally administered desogestrel ( 0.150 mg ) plus ethinyloestradiol ( 0.030 mg ) and 3-keto-desogestrel ( 0.150 mg ) plus ethinyloestradiol ( 0.030 mg ) in ten women under steady-state conditions , the serum levels of 3-keto-desogestrel were monitored by radioimmunoassay .
C0047683
3-keto-desogestrel
C0057558
desogestrel