Synonyms: 4-HYDROXY-17BETA-ESTRADIOL-1,2,16,16,17-D5;(17b)-Estra-1,3,5(10)-triene-3,4,17-triol-d5;4-Hydroxy-17b-estradiol-1,2,16,16,17-d5;4-Hydroxyestradiol-1,2,16,16,17-d5;4-Hydroxy-17β-estradiol-1,2,16,16,17-D5;(17)-Estra-1,3,5(10)-triene-3,4,17-triol-d5