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4-Methoxyestriol

Chemical compound From Wikipedia, the free encyclopedia

4-Methoxyestriol
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4-Methoxyestriol (4-MeO-E3) is an endogenous estrogen metabolite.[1][2][3][4] It is the 4-methyl ether of 4-hydroxyestriol and a metabolite of estriol and 4-hydroxyestriol.[1][2][3] 4-Methoxyestriol has very low affinities for the estrogen receptors.[4] Its relative binding affinities (RBAs) for estrogen receptor alpha (ERα) and estrogen receptor beta (ERβ) are both about 1% of those of estradiol.[4] For comparison, estriol had RBAs of 11% and 35%, respectively.[4]

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