Synonyms: 8-Aza-19-nor-17a-pregna-1,3,5(10)-trien-20-yn-17-ol,3-(cyclopentyloxy)- (8CI); 8-Aza-19-norpregna-1,3,5(10)-trien-20-yn-17-ol,3-(cyclopentyloxy)-, (17a)-; 8-Azaquinestrol; Benzo[a]cyclopenta[f]quinolizin-1-ol,8-(cyclopentyloxy)-1-ethynyl-1,2,3,3a,5,6,10b,11,12,12a-decahydro-12a-methyl-,[1R-(1a,3ab,10bb,12aa)]-