6-carboxy-5 6 7 8-tetrahydrobiopterin July 8, 2019 16 32 64 128 (6r)-5 6 7 8-tetrahydrobiopterin dihydrochloride 5 6 7 8-tetrahydronaphthalene-1-carboxylic acid (±)-6-hydroxy-2 5 7 8-tetramethylchromane-2-carboxylic acid
