Norgestrienone

Norgestrienone (INN) (brand name Ogyline, Planor), also known as 10,11-didehydro-orethisterone, as well as 17α-ethynyltrienolone (17α-ethynyltrenbolone), is a steroidal progestin that is used as a hormonal contraceptive, sometimes in combination with ethinyl estradiol. It is a relatively weak progestin, and has some androgenic effects.