Figure 4From: Advances in estrogen receptor biology: prospects for improvements in targeted breast cancer therapyChemical structures of the three FDA-approved selective estrogen receptor modulators (SERMs), the pure antiestrogen Faslodex, and the aromatase inhibitors (AIs). The SERMs include the triphenylethylenes tamoxifen and toremifene, and the benzothiophene raloxifene. AIs include the nonsteroidal anastrazole and letrozole, and the steroidal exemestane.Back to article page