[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a light brown powder.  It is a powerful alkylating agent."}, {"from": "gpt", "value": "[C][O+1][Branch1][C][C][C].[Cl][Sb-1][Branch1][C][Cl][Branch1][C][Cl][Branch1][C][Cl][Branch1][C][Cl][Cl]"}]