Chemicals observed to have some of their effects include diethylstilbestrol,  atrazine and bisphenol A.
Preparations of these from equine sources contain equilin and equilenin, while most semisynthetic routes begin with diosgenin, a wild yam extract.  Orally active pharmaceutical formulations generally include an (*) ethynyl substituent, often at the 17-carbon position, while their biological production requires the action of the enzyme aromatase on their A ring, an action which also reduces them to 18 carbons.  Chemicals observed to have some of their effects include diethylstilbestrol,  atrazine and bisphenol A. Their various types are distinguished by substitutions on the D ring; notable ones include a ketone and a the primary one in hormonal processes, a 17-beta diol.  For 10 points, name this class of steroid compounds, the primary female sex hormones.
Preparations of these from equine sources contain equilin and equilenin, while most semisynthetic routes begin with diosgenin, a wild yam extract.  
{estrogens} (2) [AU]