[{"from": "human", "value": "Could you provide a description of this molecule? [C][=C][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][131I][C][N][=C][Branch1][C][N][N].[C][=C][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][131I][C][N][=C][Branch1][C][N][N].[O][S][=Branch1][C][=O][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is the sulfate salt form of iobenguane, an iodine-131 labeled aralkylguanidine norepinephrine analogue used as a diagnostic imaging tracer. Iobenguane is structurally related to guanethidine and norepinephrine. This agent, functioning as a false substrate of norepinephrine, is taken up and localized in the granules of pre-synaptic adrenergic neurons, thus making this compound useful for the imaging of neuroendocrine tissues and tumors."}]