<unk>  can be grouped as steroidal or nonsteroidal. The steroidal<unk>  are estranes and include estradiol and its analogues, such as ethinylestradiol and conjugated<unk>  like equilin sulfate. Nonsteroidal<unk>  belong predominantly to the stilbestrol group of compounds and include diethylstilbestrol and hexestrol, among others.<unk> esters are esters and prodrugs of the corresponding parent<unk> . Examples include estradiol valerate and diethylstilbestrol dipropionate, which are prodrugs of estradiol and diethylstilbestrol, respectively.<unk> esters with fatty acid esters have increased lipophilicity and a prolonged duration of action when administered by intramuscular or subcutaneous injection. Some<unk> esters, such as polyestradiol phosphate, polyestriol phosphate, and polydiethylstilbestrol phosphate, are in the form of polymers.
Estrogen 
Estradiol 
Estradiol
Androgen
Sex hormone
Progesterone
Progesterone 
Estriol