[{"from": "human", "value": "Provide a description of this molecule. [C][/C][=C][/C][=C][/C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a preservative for many foodstuffs. Generally used as K salt or (less frequently) as Ca salt. (2E,4E)-2,4-Hexadienoic acid is an antimicrobial agent against a wide variety of microorganisms, especially yeasts and moulds. (2E,4E)-2,4-Hexadienoic acid is a preservative action more efficient in acidic foods. Typical usage levels 500-2000 ppm\n\n(2E,4E)-2,4-Hexadienoic acid belongs to the family of Unsaturated Fatty Acids. These are fatty acids whose chain contains at least one CC double bond."}]