[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an oxopurine."}, {"from": "gpt", "value": "[C][N][C][=C][Branch1][N][N][=C][Ring1][Branch1][N][Branch1][C][C][C][C][O][N][Branch1][=N][C][=Branch1][C][=O][N][Branch1][Branch1][C][Ring1][=C][=O][C][C]"}]