[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a Radioactive Diagnostic Agent. The mechanism of action of fluoroestradiol f-18 is as a Positron Emitting Activity."}, {"from": "gpt", "value": "[C][C@][C][C][C@H1][C@H1][Branch1][=N][C@@H1][Ring1][=Branch1][C][C@H1][Branch1][Branch1][C@@H1][Ring1][=Branch2][O][18F][C][C][C][=C][Ring1][N][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O]"}]