<unk>  (EE<unk> , also known as 17α-ethynylestradiol 3-sulfate, is an estrogen ester – specifically, the C3 sulfuric acid<unk>  ester of the synthetic estrogen<unk>  (EE) – and is the major metabolite of EE. Circulating levels of EE<unk>  range from 6 to 22 times those of EE when EE is taken orally. EE<unk>  can be transformed back into EE (14–21%) via steroid<unk> se, and it has been suggested that EE<unk>  may serve as a circulating reservoir for EE, similarly to the case of estrone<unk>  with estradiol. However, the EE<unk>  pool with EE is far smaller than the pool of estrone<unk>  that occurs with estradiol (with estrone<unk>  levels approximately 200-fold higher than estradiol levels on average with oral estradiol). In addition, in contrast to the case of estrone<unk>  and estrone, the conversion rate of EE<unk>  back into EE is relatively low, and has been said probably isn't of clinical significance. However, other studies have suggested that EE<unk>  may nonetheless contribute up to 20% of total EE levels.
Ethinylestradiol sulfate
Ethinylestradiol sulfonate
Lipoidal estradiol
Cloxestradiol acetate
Hexestrol diacetate
Estradiol enantate
Hydroxyprogesterone acetate
Estradiol undecylate