(E/Z)-Droloxifene

(E/Z)-Droloxifene is a mixture of (E)-droloxifene (a selective estrogen receptor modulator) and (Z)-droloxifene. (E)-Droloxifene binds to the estrogen receptor (ER) with an IC50 value of 24 nM in rabbit uterine homogenates. (E)-Droloxifene increases uterine weight in immature rats, and reduces estradiol-induced increases in uterine weight in juvenile rats. (E)-Droloxifene also inhibits 17β-estradiol-stimulated growth of MCF-7, ZR-75-1, and T47D human breast cancer cells. (Z)-Droloxifene binds weakly to ER and has no estrogenic or antiestrogenic activity[3][4].