title: Long-acting contraceptive agents: bile acid esters of norethisterone.
abstract: The synthesis of the esters of norethisterone (17 alpha-ethynyl-17 beta-hydroxyestr-4-en-3-one) with three bile acids and of the cholesteryl carbonate of norethisterone are described.
mesh_terms: D001647:Bile Acids and Salts; D003692:Delayed-Action Preparations; D004952:Esters; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D009640:Norethindrone / Q000031:analogs & derivatives*; D009904:Optical Rotation; D013053:Spectrophotometry; D013329:Structure-Activity Relationship
chemical_list: D001647:Bile Acids and Salts; D003692:Delayed-Action Preparations; D004952:Esters; D007202:Indicators and Reagents; D009640:Norethindrone