Endoxifen (hydrochloride) (Standard) is the analytical standard of Endoxifen (hydrochloride). This product is intended for research and analytical applications. Endoxifen hydrochloride is a key active metabolite of Tamoxifen (TAM) with higher affinity and specificity to estrogen receptor that also inhibits aromatase activity. Endoxifen hydrochloride has the potential for breast cancer study[1][2].