catecholamines and related compounds , such as dopamine , 5- or 6-hydroxydopamine , n-methyldopamine , tyramine , octopamine , norepinephrine and epinephrine , inhibit human liver dihydropteridine reductase ( nadh:6,7-dihydropteridine oxidoreductase , ec 1.6.99.10 ) noncompetitively with ki values ranging from 7.0 x 10 ( -6 ) - 1.9 x 10 ( -4 ) m ( i50 values = 2.0 x 10 ( -5 ) - 2.0 x 10 ( -4 ) m ) .
C0013030
dopamine
C0011498
methyldopamine