[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a colorless liquid with a strong, unpleasant odor. Floats on water. Poisonous vapor is produced. (USCG, 1999)"}, {"from": "gpt", "value": "[C][C][=C][C][=C][C][=N][Ring1][=Branch1]"}]