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A metabolite of tamoxifen
Tamoxifen is a selective estrogen receptor modulator that evokes tissue-dependent effects. Tamoxifen N-oxide is a metabolite of tamoxifen that is produced by the action of flavin-containing monooxygenases. It can be converted back to tamoxifen by cytochrome P450 isoforms and hemoglobin. Like the parent compound, tamoxifen N-oxide can form DNA adducts. Tamoxifen N-oxide is a weak inhibitor of human hydroxysteroid sulfotransferase 2A1 (Kis = 9.1 and 16.9 µM for the sulfonation of dehydroepiandrosterone and pregnenolone, respectively).
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