18 hydroxy 20 oxosteroid 1 18 hydroxydeoxycorticosterone 1 18 hydroxyprogesterone 1 19 hydroxy 3 oxosteroid 1 19 hydroxy 6 (tert butoxycarbonyl) 6 aza 4 pregnene 3,20 dione 1 19 hydroxy 6 azaprogesterone 1 19 hydroxy 6 azasteroid 1 19-Hydroxypregnane 1 3beta tert butyldimethylsilyloxy 19 formyloxy 6 aza 5 pregnen 20 one 1 3beta tert butyldimethylsilyloxy 6 (tert butoxycarbonyl) 19 formyloxy 6 aza 4 pregnen 20 one 1 3beta tert butyldimethylsilyloxy 7 azido 19 formyloxy 6 nor 5,7 secopregnane 5,20 dione 1 3beta,19 dihydroxy 6 (tert butoxycarbonyl) 6 aza 4 pregnen 20 one 1 6 azaprogesterone 1 6-Azaprogesterone 1 Animals 1 Azasteroids 1 COS Cells 1 Cercopithecus aethiops 1 Cyclization 1 Gene Expression 1 Genes, Reporter 1 Gestagenic activity 1 Humans 1 Luciferases 1 Pregnanes 1 Progesterone 1 Promoter Regions, Genetic 1 Receptors, Progesterone 1 acylation 1 animal cell 1