the ki values for 7,8-dihydro-d-neopterin , 7,8-dihydro-l-biopterin , and ( 6r ) -5,6,7,8-tetrahydro-l-biopterin are 12.7 microm , 14.4 microm , and 15.7 microm , respectively .
C0068527
neopterin
C0005562
biopterin