[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an oxopurine."}, {"from": "gpt", "value": "[C][=C][Branch1][O][N][=C][Branch1][=Branch1][N][C][Ring1][=Branch1][=O][N][N][=C][Branch1][Ring2][N][Ring1][O][N+1][=Branch1][C][=O][O-1]"}]