16-Ketoestradiol (16-keto-E2, 16-oxoestradiol, or 16-oxo-E2) is an endogenous estrogen related to 16-ketoestrone. 16-Ketoestrone is a very weak estrogen with only 1/1000 the estrogenic potency of estradiol in the uterus.
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.