<unk> , also known as progesterone 3-cyclopentyl enol ether (PCPE) or as 3-cyclopentyloxypregna-3,5-dien-20-one, is a synthetic pregnane steroid and a derivative of progesterone. It is specifically the 3-cyclopentyl enol ether of progesterone.<unk>  is closely related to progesterone 3-acetyl enol ether and pentagestrone acetate (17α-acetoxyprogesterone 3-cyclopentyl enol ether). Synthesis Chemical syntheses of<unk>  have been published.
Quingestrone
Gestodene
Hexestrol
Estradiol dienantate
Doisynoestrol
Dienestrol
Estradiol enantate
Benzestrol