13 ethyl 17 hydroxy 18 19 dinor 17alpha pregn 4 en 20 yn 3 one oxime acetate ester, 17alpha 17 acetyloxy 13 ethyl 18 19 dinorpregn 4 en 20 yn 3 one 3 oxime, d 13beta ethyl 17alpha ethynyl 17beta acetoxygon 4 en 3 one oxime
For the prevention of pregnancy