[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a 7,8-dihydrobiopterin in which the 1,2-dihydroxypropyl group has (1R,2S)-configuration; naturally occurring form. It is an enantiomer of a D-erythro-7,8-dihydrobiopterin."}, {"from": "gpt", "value": "[C][C@@H1][Branch2][Ring1][#Branch2][C@@H1][Branch2][Ring1][Branch1][C][=N][C][=C][Branch1][Branch1][N][C][Ring1][=Branch1][N][=C][Branch1][=Branch1][N][C][Ring1][Branch2][=O][N][O][O]"}]