Medchemexpress, HY-B0141 1g Estradiol β-Estradiol;E2;17β-Estradiol;17β-Oestradiol CAS:50-28-2 Formula:C18H24O2 Purity:98% Estradiol is a human sex hormone and steroid, and the primary female sex hormone. Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.