[{"from": "human", "value": "Provide a description of this molecule. [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]"}, {"from": "gpt", "value": "The molecule is a pterin derivative that consists of pterin bearing amino, oxo and 1,2-dihydroxypropyl substituents at positions 2, 4 and 6 respectively. The parent of the class of biopterins; the L-erythro isomer occurs widely in nature. It has a role as a metabolite and a coenzyme."}]