Molecular Structure article 4 chemical structure 4 chemistry 4 synthesis 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 (2,3 epoxy 2 methylbutyryloxy) 4alpha formoxy 11 hydroxy 6,7 dehydroeudesman 8 one 2 3alpha-(2,3-epoxy-2-methylbutyryloxy)-4alpha-formoxy-11-hydroxy-6,7-dehydroeudesman-8-one 2 3beta acetoxy 20 (tert butyldimethylsilyloxy) 17 (13-18)abeo 5alphah pregna 13,15,17 triene 2 Animals 2 Antiestrogenic activity 2 Antifeedant activity 2 Antineoplastic Agents, Hormonal 2 Antiproliferative activity 2 Asteraceae 2 Cabrera 2 Cell Proliferation 2 Crystallography, X-Ray 2 Dose-Response Relationship, Drug 2 Drug Screening Assays, Antitumor 2 Ergosterol 2 Estrogen Antagonists 2 Eudesmanes 2 Feeding Behavior 2