2-Hydroxyestradiol
2-Hydroxyestradiol (2-OHE2), also known as estra-1,3,5(10)-triene-2,3,17β-triol, is an endogenous steroid, catechol estrogen, and metabolite of estradiol, as well as a positional isomer of estriol. == Biosynthesis == Transformation of estradiol to 2-hydroxyestradiol is a major metabolic pathway of estradiol in the liver.