[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a tetrahydropterin, a member of biopterins and a diol. It has a role as a prosthetic group, a coenzyme, a nutraceutical and a human metabolite."}, {"from": "gpt", "value": "[C][C][Branch2][Ring1][N][C][Branch2][Ring1][#Branch1][C][C][N][C][=C][Branch1][Ring2][N][Ring1][=Branch1][C][=Branch1][C][=O][N][C][=Branch1][Ring2][=N][Ring1][Branch2][N][O][O]"}]