(E)-4-Hydroxytamoxifen-d5

(E)-4-Hydroxytamoxifen-d5 E)-Afimoxifene-d5) is the deuterium labeled (E)-4-Hydroxytamoxifen. (E)-4-Hydroxytamoxifen E)-Afimoxifene), the less active isomer of (Z)-4-hydroxytamoxifen, is an estrogen receptor modulator.