[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][#Branch1][C][#N][Hg][C][#N]"}, {"from": "gpt", "value": "The molecule appears as odorless tetragonal crystals or white powder. Toxic by inhalation (dust, and the hydrogen cyanide from decomposition) and by ingestion. Toxic oxides of nitrogen are produced in fires."}]