[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a pyrimidone."}, {"from": "gpt", "value": "[C][=C][O][C][=Branch1][Ring2][=C][Ring1][Branch1][C][N][C][=Branch1][C][=O][C][=C][Branch1][=Branch1][N][C][Ring1][#Branch1][=S][N]"}]