reduced pterins , such as 7,8-dihydro-d-neopterin , ( 6r , s ) -5,6,7,8-tetrahydro-d-neopterin , 7,8-dihydro-l-biopterin , ( 6r ) -5,6,7,8-tetrahydro-l-biopterin , l-sepiapterin , and dl-6-methyl-5,6,7,8-tetrahydropterin are approximately 12-times more potent as inhibitors than are oxidized pterins , such as d-neopterin , l-biopterin , and isoxanthopterin .
C0068527
neopterin
C0005562
biopterin