[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is the hydrochloride salt of mechlorethamine. It has a role as an antineoplastic agent. It contains a mechlorethamine."}, {"from": "gpt", "value": "[C][N][Branch1][Ring2][C][C][Cl][C][C][Cl].[Cl]"}]