[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is guanosine substituted at the purine 8-position by a nitro group."}, {"from": "gpt", "value": "[C][Branch2][Ring2][N][C@@H1][C@H1][Branch2][Ring2][=Branch1][C@H1][Branch2][Ring1][P][C@@H1][Branch1][Ring2][O][Ring1][Branch1][N][C][=C][Branch1][=N][C][=Branch1][C][=O][N][C][=Branch1][Ring2][=N][Ring1][#Branch1][N][N][=C][Ring1][O][N+1][=Branch1][C][=O][O-1][O][O][O]"}]