[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a nitrosamine that is N-ethylethanamine substituted by a nitroso group at the N-atom. It has a role as a mutagen, a hepatotoxic agent and a carcinogenic agent."}, {"from": "gpt", "value": "[C][C][N][Branch1][Ring1][C][C][N][=O]"}]