[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an oxopurine in which the purine ring is substituted by oxo groups at positions 2, 6, and 8, and the nitrogens at positions 1, 3, and 7 are substituted by methyl groups. It is a metabolite of caffeine. It has a role as a human xenobiotic metabolite, a human blood serum metabolite, a mouse metabolite and a human urinary metabolite. It is a conjugate acid of a 1,3,7-trimethylurate."}, {"from": "gpt", "value": "[C][N][C][=C][Branch1][=Branch1][N][C][Ring1][Branch1][=O][N][Branch1][=N][C][=Branch1][C][=O][N][Branch1][Branch1][C][Ring1][#Branch2][=O][C][C]"}]