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4363 Ethinylestradiol sulfate
0f6a21494290fad82062b998dee0bac8852895bf0cfe8ee7a95dec6d5550d4fa

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

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