[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a methyl ketone that is butan-2-one substituted by a cyano group at position 3. It has a role as a metabolite. It is a methyl ketone and a nitrile. It is functionally related to a butan-2-one."}, {"from": "gpt", "value": "[C][C][Branch1][Ring1][C][#N][C][=Branch1][C][=O][C]"}]