[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a propanone that is propan-2-one substituted by a phenyl group at position 1. It is a member of propanones and a methyl ketone."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]