[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. A pteridine derivative present in body fluids; elevated levels result from immune system activation, malignant disease, allograft rejection, and viral infections. (From Stedman, 26th ed) Neopterin also serves as a precursor in the biosynthesis of biopterin."}, {"from": "gpt", "value": "[C][=C][Branch2][Ring1][Ring1][N][=C][C][=Branch1][C][=O][N][C][=Branch1][Branch2][=N][C][Ring1][#Branch1][=N][Ring1][O][N][C@H1][Branch1][#Branch1][C@@H1][Branch1][Ring1][C][O][O][O]"}]