[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a chloroalkane that is propane substituted by chloro groups at positions 1,1,3 and 3, respectively."}, {"from": "gpt", "value": "[C][C][Branch1][=Branch1][C][Branch1][C][Cl][Cl][C][Branch1][C][Cl][Cl]"}]