[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an Estrogen Receptor Antagonist. The mechanism of action of fulvestrant is as an Estrogen Receptor Antagonist, and Selective Estrogen Receptor Modulator."}, {"from": "gpt", "value": "[C][C@][C][C][C@H1][C@H1][Branch1][#Branch2][C@@H1][Ring1][=Branch1][C][C][C@@H1][Ring1][=Branch2][O][C@@H1][Branch1][#C][C][C][=C][Ring1][O][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][C][C][C][C][C][C][C][C][S][=Branch1][C][=O][C][C][C][C][Branch1][=Branch2][C][Branch1][C][F][Branch1][C][F][F][Branch1][C][F][F]"}]