[{"from": "human", "value": "Describe this molecule. [C][O+1][Branch1][C][C][C].[Cl][Sb-1][Branch1][C][Cl][Branch1][C][Cl][Branch1][C][Cl][Branch1][C][Cl][Cl]"}, {"from": "gpt", "value": "The molecule is a light brown powder.  It is a powerful alkylating agent."}]