[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an alkane that is undecane substituted by methyl groups at positions 4 and 6. It has a role as a human metabolite. It derives from a hydride of an undecane."}, {"from": "gpt", "value": "[C][C][C][C][C][C][Branch1][C][C][C][C][Branch1][C][C][C][C][C]"}]