<unk> , or 17α-methylestradiol (17α-ME), also known as 17α-methylestra-1,3,5(10)-triene-3,17β-diol, is a synthetic estrane steroid and a derivative of estradiol. It is specifically the derivative of estradiol with a methyl group at the C17α positions. Closely related steroids include ethinylestradiol (17α-ethynylestradiol) and<unk>  (17α-ethylestradiol). The C3 cyclopentyl ether of<unk>  has been studied and shows greater oral potency than<unk>  in animals, similarly to quinestrol (ethinylestradiol 3-cyclopentyl ether) and quinestradol (estriol 3-cyclopentyl ether).
Methylestradiol
Progestogen 
Progestogen
Vinyltestosterone
2-Hydroxyestradiol
Methyltestosterone
Ethinylestradiol
Cloxestradiol