[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an alkane that is butane substituted by a methyl group at positions 2 and 3. It is an alkane and a volatile organic compound. It derives from a hydride of a butane."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][Branch1][C][C][C]"}]