title: 15α-Hydroxyestradiol
text: # 15α-Hydroxyestradiol
  
  15α-Hydroxyestradiol (15α-OH-E2) is an endogenous estrogen which occurs during pregnancy. It is structurally related to estriol (16α-hydroxyestradiol) and estetrol (15α-hydroxyestriol or 15α,16α-dihydroxyestradiol).
  
  