[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][=Branch1][C][=O][N][C][=C][Branch2][Ring1][#Branch2][C][=Branch1][P][=C][Branch1][=N][C][=Branch1][Branch1][=C][Ring1][=Branch1][125I][C][=Branch1][C][=O][O-1][125I][C][=Branch1][C][=O][N][C][125I].[Na+1]"}, {"from": "gpt", "value": "The molecule is the sodium salt form of iothalamate, an organic iodine compound, labeled with iodine I-125 and used as a radiopharmaceutical. Iothalamate sodium I-125 is cleared by glomerular filtration without tubular secretion or reabsorption and can be used as a diagnostic tool to determine the glomerular filtration rate."}]