17-Hydroxy-19-nor-17.alpha.-pregna-4,9,11-trien-20-yn-3-one 17.alpha.-Ethynyltrienolone 19-Nor-17.alpha.-pregna-4,9,11-trien-20-yn-3-one, 17-hydroxy- 19-Norpregna-4,9,11-trien-20-yn-3-one, 17-hydroxy-, (17.alpha.)- 848-21-5 A 301 Ethynyl trienolone NSC101105 Norgestrienone Ogyline R 2010