17-Hydroxy(17.alpha.)-19-norpregn-5(10)-en-20-yn-3-one 17-Hydroxy-19-nor-17.alpha.-pregn-5(10)-en-20-yn-3-one 17.alpha.-Ethinyl-.delta.(sup)-5,10-19-nortestosterone 17.alpha.-Ethinyl-17.beta.-hydroxy-.delta.(sup 5(10))-estren-3-one 17.alpha.-Ethinyl-5,10-estrenolone 17.alpha.-Ethinyl-estra(5,10)eneolone 17.alpha.-Ethynyl-17-hydroxy-5(10)-estren-3-one 17.alpha.-Ethynyl-17.beta.-hydroxy-.delta.(sup 5(10))-estren-3-one 17.alpha.-Ethynyl-17.beta.-hydroxy-3-oxo-.delta.(sup 5(10))-estrene 17.alpha.-Ethynyl-17.beta.-hydroxyester-5(10)-en-3-one 17.alpha.-Ethynyl-17.beta.-hydroxyestr-5(10)-en-3-one 17.alpha.-Ethynyl-19-nor-5(10)-androsten-17.beta.-ol-3-one 17.alpha.-Ethynyl-5(10)-estren-17-ol-3-one 17.alpha.-Ethynyl-estr-5(10)-en-3-on-17.beta.-ol 17.alpha.-Ethynylestr-5(10)-en-17.beta.-ol-3-one 19-Nor-17.alpha.-pregn-5(10)-en-20-yn-3-one, 17-hydroxy- 19-Norethynodrel 19-Norpregn-5(10)-en-20-yn-3-one, 17-hydroxy-, (17.alpha.)- 68-23-5 Enidrel Estr-5(10)-en-3-one, 17.alpha.-ethynyl-17-hydroxy- Infecundin NSC15432 Norethinodrel Norethinynodrel Norethynodral Norethynodrel SC-4642 WLN: L E5 B666 OV MUTJ E1 F1UU1 QQ component of Enovid