[{"from": "human", "value": "What can you tell me about this molecule? [C][C][/C][=Branch2][Ring1][=C][=C][Branch1][=Branch2][\\C][=C][C][=C][C][=C][Ring1][=Branch1][/C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][C][C][N][Branch1][C][C][C][/C][=C][C][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a non-steroidal antiestrogen used to treat estrogen receptor positive breast cancers as well as prevent the incidence of breast cancer in high risk populations. Tamoxifen is used alone or as an adjuvant in these treatments. Tamoxifen may no longer be the preferred treatment for these types of cancers as patients generally have better survival, side effect profiles, and compliance with [anastrozole].  Tamoxifen was granted FDA approval on 30 December 1977."}]