[{"from": "human", "value": "Could you provide a description of this molecule? [N+1][=Branch1][C][=O][Branch1][=Branch1][N+1][=Branch1][C][=O][O-1][O-1]"}, {"from": "gpt", "value": "The molecule appears as red-brown liquid with a sharp, unpleasant chemical odor. Low-boiling (boiling point 21.15 \u00b0C) and held as a liquid by compression. Density 1.448 g / cm3. Consists of an equilibrium mixture of brown NO2 (nitrogen dioxide) and colorless N2O4 (dinitrogen tetroxide). Evolves poisonous brown vapors. Cylinders and ton containers may not be equipped with a safety relief device. Prolonged exposure of the containers to fire or heat may result in their violent rupturing and rocketing."}]