[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an alkane that is pentane substituted by a methyl group at positions 2,3 and 4. It is a constituent of gasoline. It has a role as a mammalian metabolite and a nephrotoxic agent. It is an alkane and a volatile organic compound."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][Branch1][C][C][C][Branch1][C][C][C]"}]