[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an oxopurine."}, {"from": "gpt", "value": "[C][N][C][=C][Branch1][=C][C][=Branch1][C][=O][N][C][=Branch1][C][=O][N][Ring1][Branch2][C][N][C][Ring1][N][=O]"}]