19-Norpregna-1,3,5(10)-trien-3-ol and loweralkyl homologs thereof wherein the alkyl group attached in the 17.beta. position contains from 2 to 7 carbon atoms. Said compounds, along with the corresponding known 17.beta.-methyl derivative, are found to have antifertility activity, and particularly postcoital antifertility activity, along with very low estrogenic activity, when administered orally to mammals.
19-去甲孕烷-1,3,5(10)-
三烯-3-醇及其17β位附加的烷基含有2至7个碳原子的低碳烷基同系物。当口服给哺乳动物时,这些化合物以及相应的已知17β-甲基衍
生物被发现具有抗生育活性,特别是后性交抗生育活性,以及非常低的
雌激素活性。