[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an alkane that is undecane substituted by methyl groups at positions 3 and 8. Metabolite observed in cancer metabolism. It has a role as a human metabolite. It derives from a hydride of an undecane."}, {"from": "gpt", "value": "[C][C][C][C][Branch1][C][C][C][C][C][C][C][Branch1][C][C][C][C]"}]