[{"from": "human", "value": "Describe this molecule. [C][=C][Branch1][=Branch2][N][C][=Branch1][C][=O][N][Ring1][=Branch1][N][=C][Branch1][=Branch1][N][C][Ring1][#Branch2][=O][N]"}, {"from": "gpt", "value": "The molecule is an oxopurine that is guanine in which the hydrogen at position 8 is replaced by an oxo group and in which the nitrogens at positions 7 and 9 each bear a hydrogen. It is functionally related to a guanine."}]