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