tamoxifen

A drug that is a selective estrogen receptor modulator, C₂₆H₂₉NOS, used in the form of its citrate primarily to treat breast cancer in women whose tumors are estrogen-dependent and to prevent breast cancer in high-risk women.

a chemical compound (C26H29NO) which is non-steroidal but physiogically active as an estrogen antagonist. It is used to treat postmenopausal breast cancer. Chemically it is 1-p-dimethylaminoethoxyphenyl-trans-1,2-diphenyl-but-1-ene. It can be obtained as a white crystalline powder.

A nonsteroidal estrogen antagonist used in the treatment of advanced breast cancer

an antagonist for estrogen that is used in the treatment of breast cancer