[{"from": "human", "value": "Provide a description of this molecule. [C][C][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is made by some trees and found in some fruits and vegetables in small amounts. It is also released to the air from car and truck exhausts. The known health effects to people from exposure to butanone are irritation of the nose, throat, skin, and eyes. (wikipedia)."}]