ent-Estradiol (ent-E2), or 1-estradiol (1-E2), is an estrogen and the 1-enantiomorph of estradiol. It is a so-called "short-acting" or "impeded" estrogen, similarly to estriol, 17α-estradiol, and dimethylstilbestrol.
The compounds of every Wikipedia article carrying a Chembox or a Drugbox, refreshed daily, with the values their infoboxes give. The pages need JavaScript; the API does not.