[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=C][C][=C]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid with a petroleum-like odor. Density 5.7 lb / gal. Flash point -65 \u00b0F. Boiling point 93 \u00b0F. May polymerize exothermically if heated or contaminated. If polymerization takes place inside a closed container, the container may rupture violently. Less dense than water and insoluble in water. Vapors heavier than air."}]