has role phenolic steroid estradiol oestradiol CHEBI:42364 estra-1,3,5(10)-triene-3,17-diol Wikipedia:Estradiol CHEBI:23965 A 3-hydroxy steroid that is estra-1,3,5(10)-triene substituted by hydroxy groups at positions 3 and 17. estrane 3-hydroxy steroid 17-hydroxy steroid estrogen human metabolite