Catalog Number: 3705
Chemical Name: (E/Z)-4-[1-[4-[2-(Methylamino)ethoxy]phenyl]-2-phenyl-1-buten-1-yl]-phenol
Biological Activity
Estrogen receptor α (ERα) ligand; potent antiestrogen. Metabolite of tamoxifen (Cat. No. 0999). Primary metabolite responsible for the effectiveness of tamoxifen in ER-positive breast cancer.
Technical Data
  • M.Wt:
    373.49
  • Formula:
    C25H27NO2
  • Solubility:
    Soluble to 100 mM in DMSO
  • Purity:
    >98%
  • Storage:
    Store at +4°C
  • CAS No:
    112093-28-4
The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis. All Tocris products are intended for laboratory research use only.
Background References
  1. Endoxifen, a secondary metabolite of tamoxifen, and 4-OH-tamoxifen induce similar changes in global gene expression patterns in MCF-7 breast cancer cells.
    Lim et al.
    J.Pharmacol.Exp.Ther., 2006;318:503
  2. The tamoxifen metabolite, endoxifen, is a potent antiestrogen that targets estrogen receptor a for degradation in breast cancer cells.
    Wu et al.
    Cancer Res., 2009;69:1722
  3. Estrogen receptor-beta sensitizes breast cancer cells to the anti-estrogenic actions of endoxifen.
    Wu et al.
    Breast Cancer Res., 2011;13:R27

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