Molecular Structure controlled study unclassified drug 8 article 6 nonhuman 6 Animals 4 Steroids 4 Structure-Activity Relationship 4 chemical structure 4 chemistry 4 dose response 4 drug activity 4 drug effects 4 drug structure 4 in vitro study 4 structure activity relation 4 17(13-18)abeo 5alphah pregna 2,13,15,17 tetraen 1,20 dione 2 1alpha hydroxy 17(13-18) abeo 5alphah pregna 2,13,15,17 tetraen 20 one 2 20 (tert butyldimethylsilyloxy) 17 (13-18) abeo 5alphah pregna 13,15,17 trien 3beta ol 2 20 acetoxy 17(13-18) abeo 5alphah pregna 2,13,15,17 tetraen 1alpha ol 2 20 acetoxy 17(13-18)abeo 5alphah pregna 13,15,17 trien 3 one 2 20 acetoxy 17(13-18)abeo5alphah pregna 1,13,15,17 tetraen 3 one 2 20 acetoxy 1alpha,2alpha epoxy 17(13-18)abeo 5alphah pregna 13,15,17 trien 3 one 2 3alpha hydroxy 11,19 epoxypregn 4 ene 20 one 2 3alpha hydroxy 1alpha,11alpha epoxy 5beta pregnan 20 one 2 3alpha hydroxy 1beta,11alpha epoxy 5alpha pregnan 20 one 2 3alpha hydroxy 5alpha pregnan 20 one 2 3beta acetoxy 20 (tert butyldimethylsilyloxy) 17 (13-18)abeo 5alphah pregna 13,15,17 triene 2 3beta bromo 5 hydroxy 5alpha androstane 6,17 dione 2 3beta bromo 5 hydroxy dextro homo 17alpha oxa 5alpha androstane 6,17 dione 2