[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch2][Ring1][Ring1][C][O][P][=Branch1][C][=O][Branch1][C][N][N][Branch1][Ring2][C][C][Cl][C][C][Cl][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a nitrogen mustard."}]