[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a 5,6,7,8-tetrahydrobiopterin in which the 1,2-dihydroxypropyl group has (1S,2S)-configuration."}, {"from": "gpt", "value": "[C][C@@H1][Branch2][Ring1][N][C@H1][Branch2][Ring1][#Branch1][C@H1][C][N][C][=C][Branch1][Ring2][N][Ring1][=Branch1][C][=Branch1][C][=O][N][C][=Branch1][Ring2][=N][Ring1][Branch2][N][O][O]"}]