Estetrol is an estrogenic steroid molecule produced exclusively during pregnancy by the fetal liver. Synonyms: 15alpha-Hydroxyestriol; 3,15alpha,16alpha,17beta-Tetrahydroxyestra-1,3,5(10)-triene; E4; Estra-1,3,5(10)-triene-3,15alpha,16alpha,17beta-tetrol; Oestetrol Molecular Formula: C18H24O4...