[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a hexadecenoic acid having a trans-double bond at the 2-position. It has a role as a metabolite. It is a hexadecenoic acid and an alpha,beta-unsaturated monocarboxylic acid. It is a conjugate acid of an (E)-hexadec-2-enoate."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][/C][=C][/C][=Branch1][C][=O][O]"}]