<unk> , also known as 16α-hydroxyestradiol or as estra-1,3,5(10)-triene-3,16α,17β-triol, is a naturally occurring estrane steroid with double bonds between the C1 and C2, C3 and C4, and C5 and C10 positions and hydroxyl groups at the C3, C16α, and C17β positions. The name<unk>  and the abbreviation<unk>  were derived from the chemical terms estrin (estra-1,3,5(10)-triene) and triol (three hydroxyl groups).
Estriol
2-Hydroxyestradiol
Estradiol acetate
Estrogen 
Estrogen
11-Ketoprogesterone
Estradiol 
Estradiol