17 epiestriol

17-Epiestriol is a metabolite of estrone .1It is formed from estroneviaa 16α-hydroxy estrone intermediate by reduction of the C-17 ketone. 17-Epiestriol binds to estrogen receptor α (ERα) and ERβ with relative binding affinities of 29 and 80 compared with 17β-estradiol .2 1.Brinton, L.A., Trabert, B., Anderson, G.L., et al.Serum estrogens and estrogen metabolites and endometrial cancer risk among postmenopausal womenCancer Epidemiol. Biomarkers Prev.25(7)1081-1089(2016) 2.Kuiper, G.G.J.M., Lemmen, J.G., Carlsson, B., et al.Interaction of estrogenic chemicals and phytoestrogens with estrogen receptor βEndocrinology139(10)4252-4263(1998)