作者:A.S.C. Wan、T.L. Ngiam、S.L. Leung、M.L. Go、C.G. Francisco、R. Freire、R. Hernandez、J.A. Salazar、E. Suarez、G.A. Garcia、O. Jimeno、J.A.Noguez A.、A.Acosta H.、R. Vlahov、V. Tarpanov、M. Boshkova-Ljapova、B. Milenkov、V. Stoilova、J. Vlahov、G. Snatzke                                    
                                    
                                        DOI:10.1016/0039-128x(83)90105-8
                                    
                                    
                                        日期:1983.3
                                    
                                    Esters of levonorgestrel (13 beta-ethyl-17 beta-ethynyl-17 beta-hydroxygon-4-en-3-one) with a variety of unsaturated carboxylic acids have been synthesized for evaluation as potential long-acting, injectable contraceptive agents.