19-norpregna-1,3,5(10),17-(20)-tetraen-3-ol

17α-(4',4'-bis(ethylthio)-4'-ethoxycarbonylbut-1'-yn-1'-yl)-3-t-butyldimethylsilanyloxy-estra-1,3,5(10)-triene-17β-ol

17α-(6',6'-bis(ethylthio)-6'-ethoxycarbonylhex-1'-yn-1'-yl)-3-t-butyldimethylsilanyloxy-estra-1,3,5(10)-triene-17β-ol