[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a simple monocarboxylic acid containing two carbons. It has a role as a protic solvent, a food acidity regulator, an antimicrobial food preservative and a Daphnia magna metabolite. It is a conjugate acid of an acetate."}]