.DELTA.4-17.alpha.-Ethinylestren-17.beta.-ol 17.alpha.-Ethynylestrenol 19-Nor-17.alpha.-pregn-4-en-20-yn-17-ol 19-Norpregn-4-en-20-yn-17-ol, (17.alpha.)- 3-Desoxynorlutin 52-76-6 Endometril Estr-4-en-17.beta.-ol, 17-ethynyl- Ethinylestrenol Ethynylestrenol Exlution Exluton Exlutona IND 1006 Linestrenol Lynestrenol NSC73879 Org 485-50 Orgametil Orgametril Orgametrol