Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Chemical structures of ginsenoside Rb1 as well as natural forms of human estrogens. Ginsenoside Rb1 possesses 4 trans-ring rigid steroid skeletons with a modified side-chain at C20, C24-C25 double bound, and 4 glucose moieties. Estrone (E1), estradiol (E2), and estriol (E3) are the major naturally occurring forms of estrogens in females. Estetrol (E4) is produced only during pregnancy.
