Synonyms: 17a-Estradiol (8CI);1,3,5-Estratriene-3,17a-diol;13b-Methyl-1,3,5(10)-gonatriene-3,17a-diol;17-Epiestradiol;17a-Oestradiol;3,17-Dihydroxyestratriene;3,17a-Dihydroxyestra-1,3,5(10)-triene;3,17a-Dihydroxyoestra-1,3,5(10)-triene;Alfatradiol;Epiestrol;Estra-1,3,5(10)-triene-3,17a-diol;NSC 20293;Oestra-1,3,5(10)-triene-3,17a-diol;a-Estradiol;