[{"from": "human", "value": "Provide a description of this molecule. [C][C][C][C][C][C][C][C][C][C][C][C][=C]"}, {"from": "gpt", "value": "Watery colorless liquid with a mild pleasant odor. Less dense than water and insoluble in water. Hence floats on water. (USCG, 1999)"}]