[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][Branch1][C][C][Branch1][C][C][C][N][C][=Branch1][C][=O][N][Branch1][Ring2][C][C][Cl][N][=O]"}, {"from": "gpt", "value": "The molecule is a (2-chloroethy1)nitrosourea compound with antineoplastic activity. Petamustine was never marketed."}]