[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][Branch1][C][C][Branch1][Ring2][C][N+1][#C-1][O][C].[C][C][Branch1][C][C][Branch1][Ring2][C][N+1][#C-1][O][C].[C][C][Branch1][C][C][Branch1][Ring2][C][N+1][#C-1][O][C].[C][C][Branch1][C][C][Branch1][Ring2][C][N+1][#C-1][O][C].[C][C][Branch1][C][C][Branch1][Ring2][C][N+1][#C-1][O][C].[C][C][Branch1][C][C][Branch1][Ring2][C][N+1][#C-1][O][C].[Tc]"}, {"from": "gpt", "value": "The molecule is sestamibi is a large synthetic molecule of the isonitrile family, which can be labeled with Tc99m.  It passes through cells membranes passively, collecting in cells with large numbers of mitochondria.  It is often used for imaging of the thyroid and parathyroid."}]