Background:

Desogestrel(Org-2969) is a third-generation 19-nortestosterone derivative progestogen; is contained in many oral contraceptive preparations, both combined (COCs) to ethinyl-estradiol (EE) or alone in a progestin-only pill (POP).

参考文献:
[1]. Gassen DT, et al. Evaluation of hormonal suppression with two contraceptive regimens using ethinyl estradiol and desogestrel. Arch Gynecol Obstet. 2013 Feb;287(2):289-94.