[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule appears as a colorless watery liquid with a sweet odor. Less dense than water. Insoluble in water. Irritating vapor. (USCG, 1999)"}, {"from": "gpt", "value": "[C][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][C]"}]