[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is chlormerodrin containing the radioactive isotope (203)Hg. It was formerly used as a diagnostic aid in determination of renal function. It has a role as a radioactive imaging agent. It is a chlormerodrin and an isotopically modified compound."}, {"from": "gpt", "value": "[C][O][C][Branch1][Branch2][C][N][C][=Branch1][C][=O][N][C][203Hg][Cl]"}]