19-Nor-17.alpha.-pregn-5(10)-en-20-yne-3.alpha.,17-diol 19-Nor-17.alpha.-pregn-5(10)-en-20-yne-3.alpha.-17.beta.-diol 19-Norpregn-5(10)-en-20-yne-3,17-diol, (3.alpha.,17.alpha.)- 21466-08-0 3.alpha.-Hydroxynorethynodrel NSC77061