[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the (E)-stereoisomer of hexenoic acid. It has a role as a metabolite. It is a conjugate acid of a (2E)-hexenoate."}, {"from": "gpt", "value": "[C][C][C][/C][=C][/C][=Branch1][C][=O][O]"}]