[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an alkatetraene that is 1,3,5,7-octatetraene substituted by methyl groups at positions 2 and 6 respectively. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=C][/C][=C][/C][=C][Branch1][C][\\C][/C][=C]"}]