[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=C][C][=C][C][=N][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a colorless liquid with a strong, unpleasant odor. Floats on water. Poisonous vapor is produced. (USCG, 1999)"}]