[{"from": "human", "value": "Provide a description of this molecule. [C][C][=N][C][=C][Branch1][Branch2][C][=Branch1][Ring2][=N][Ring1][=Branch1][N][C][N][C][=Branch1][C][=O][N][Branch1][Ring2][C][C][Cl][N][=O].[Cl]"}, {"from": "gpt", "value": "The molecule is the hydrochloride salt of nimustine, a nitrosourea with antineoplastic activity. Nimustine alkylates and crosslinks DNA, thereby causing DNA fragmentation, inhibition of protein synthesis, and cell death."}]