The molecule is a 17alpha-hydroxy steroid and a terminal acetylenic compound. It derives from a norgestrel. It is an enantiomer of a levonorgestrel.
(8S,9R,10S,13R,14R,17S)-13-ethyl-17-ethynyl-17-hydroxy-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one