4-Hydroxytamoxifen (Afimoxifene) (S7827-GRP)

4-Hydroxytamoxifen (Afimoxifene) is the active metabolite of tamoxifen and a selective estrogen receptor (ER) modulator that is widely used in the therapeutic and chemopreventive treatment of breast cancer. It activates on-target modification frequency for intein-Cas9 variants.