[{"from": "human", "value": "Please give me some details about this molecule. [C][=Branch1][C][=O][Branch1][C][Cl][Cl]"}, {"from": "gpt", "value": "The molecule appears as a colorless gas or very low-boiling, volatile liquid with an odor of new-mown hay or green corn. Extremely toxic. Warning properties of the gas inhaled are slight, death may occur within 36 hours (Lewis, 3rd ed., 1993, p. 1027). Prolonged exposure of the containers to intense heat may result in their violent rupturing and rocketing.   Rate of onset: Immediate & Delayed (Lungs)  Persistence: Minutes - hours  Odor threshold: 0.5 ppm  Source/use/other hazard: Dye, pesticide, and other industries; history as war gas, corrosive/irritating."}]