<unk>  is a synthetic estrane steroid and an estradiol ester. It is specifically the C17β<unk>  (undecanoate) ester of estradiol. The compound is also known as estradiol 17β-undecylate or as estra-1,3,5(10)-triene-3,17β-diol 17β-undecanoate. The undecylic acid (undecanoic acid) ester of<unk>  is a medium-chain fatty acid and is found naturally in many foods, some examples of which include coconut, fruits, fats, oils, and rice.<unk>  is a relatively long-chain ester of estradiol. Its<unk>  ester contains 11 carbon atoms. For comparison, the ester chains of estradiol acetate, estradiol valerate, and estradiol enantate have 2, 5, and 7 carbon atoms, respectively. As a result of its longer ester chain,<unk>  is the most lipophilic of these estradiol esters, and for this reason, has by far the longest duration when administered in oil solution by intramuscular injection. A few estradiol esters related to<unk>  include estradiol decanoate, estradiol diundecylate, and estradiol diundecylenate.<unk>  shares the same<unk>  ester as testosterone undecanoate, an androgen/anabolic steroid and very long-lasting testosterone ester.<unk>  is one of the longest-chain steroid esters that has been in common medical use.
Estradiol undecylate
Estradiol dienantate
Estradiol enantate
Estradiol furoate
Estradiol valerate
Estradiol hemisuccinate
Estradiol diundecylenate
Estradiol dipropionate