[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an alkylbenzene that is benzene substituted by a butan-2-yl group."}, {"from": "gpt", "value": "[C][C][C][Branch1][C][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]