17-Hydroxy-19-nor-17.alpha.-pregn-4-en-20-yn-3-one 17.alpha.-Ethinyl-17.beta.-hydroxy-.delta.(sup:4)-estren-3-one 17.alpha.-Ethinyl-19-nortestosterone 17.alpha.-Ethinylestra-4-en-17.beta.-ol-3-one 17.alpha.-Ethynyl-17-hydroxy-4-estren-3-one 17.alpha.-Ethynyl-17.beta.-hydroxy-19-norandrost-4-en-3-one 17.alpha.-Ethynyl-17.beta.-hydroxyestr-4-en-3-one 17.alpha.-Ethynyl-19-nor-4-androsten-17.beta.-ol-3-one 17.alpha.-Ethynyl-19-norandrost-4-en-17.beta.-ol-3-one 17.alpha.-Ethynyl-19-nortestosterone 17.alpha.-Ethynyl-4-estren-17-ol-3-one 17.beta.-Hydroxy-19-norpregn-4-en-20-yn-3-one 19-Nor-17.alpha.-ethynyltestosterone 19-Nor-17.alpha.-pregn-4-en-20-yn-3-one, 17-hydroxy- 19-Norethisterone 19-Norpregn-4-en-20-yn-3-one, 17-hydroxy-, (17.alpha.)- 19-Nortestosterone, 17-ethynyl- 19-nor-17.alpha.-Ethynyl-17.beta.-hydroxy-4-androsten-3-one 19-nor-17.alpha.-Ethynylandrosten-17.beta.-ol-3-one 68-22-4 Anhydrohydroxynorprogesterone Anovule Conludaf Conludag Estr-4-en-3-one, 17.alpha.-ethynyl-17-hydroxy- Ethinylnortestosterone Ethynylnortestosterone Gestest Micronett Micronor Micronovum Mini-Pe Minovlar NSC-9564 NSC9564 Nor-Q.D. Noralutin Noresthisterone Norethindrone Norethisteron Norethisterone Norethyndron Norethynodrone Norfor Norgestin Noriday Norlutate Norluten Norlutin Norluton Norpregneninlone Norpregneninolone Primolut N Proluteasi SC 4640 Utovlar WLN: L E5 B666 OV MUTJ E FQ F1UU1 -A&F component of Brevicon component of Modicon component of Neocon component of Noriday component of Norinyl component of Ortho-Novum component of Ovcon