[{"from": "human", "value": "Provide a description of this molecule. [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]"}, {"from": "gpt", "value": "The molecule is a 7,8-dihydrobiopterin in which the 1,2-dihydroxypropyl group has (1S,2S)-configuration."}]