[{"from": "human", "value": "Describe this molecule. [C][C][C][C][=Branch1][C][=O][Cl]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid with a sharp odor. Slightly denser than water. Flash point near 20 \u00b0F. Severely irritates skin, eyes, and mucous membranes. Used to make other chemicals."}]