[{"from": "human", "value": "Provide a description of this molecule. [C][O][C][=C][Branch2][Ring1][Branch2][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=C][C][=Branch1][=Branch2][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][O][C][N]"}, {"from": "gpt", "value": "The molecule appears as colorless crystals or a light brown powder. Turns violet on standing. Carcinogen."}]