U-2309Tetrahydrogestrinone17α-Alkylated 5α-dihydro-19-nortestosterone derivatives: 5α-Dihydronorethandrolone5α-Dihydronormethandrone17α-Vinyltestosterone derivatives: Norvinisterone (vinylnortestosterone)17α-Vinyl-19-nortestosterone derivatives: Vinyltestosterone17α-Ethynyltestosterone derivatives: DanazolEthinylandrostenediolEthandrostateEthisterone (ethynyltestosterone)5α-Dihydro-17α-ethynyltestosterone derivatives: 17α-Ethynyl-3α-androstanediol17α-Ethynyl-3β-androstanediolDihydroethisterone17α-Ethynyl-19-nortestosterone derivatives: Δ4-TiboloneDesogestrelEtonogestrelEtynodiolEtynodiol diacetateGestodeneGestrinoneLevonorgestrelLevonorgestrel esters (e.g., levonorgestrel butanoate)LynestrenolLynestrenol phenylpropionateNorethisteroneNorethisterone esters (e.g., norethisterone acetate, norethisterone enanthate)NorgestrelNorgestrienoneQuingestanolQuingestanol acetateTibolone5α-Dihydro-17α-ethynyl-19-nortestosterone derivatives: 5α-Dihydrolevonorgestrel5α-