[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a Radioactive Diagnostic Agent. The mechanism of action of iobenguane i-131 is as a Radiopharmaceutical Activity."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][131I][C][N][=C][Branch1][C][N][N]"}]