the inhibitory strength of the catecholamines and related compounds tested against this enzyme can be arranged in the following order : dopamine , 6-hydroxydopamine , 5-hydroxydopamine , n-methyldopamine greater than tyramine , 3-o-methyldopamine , 4-o-methyldopamine much greater than epinephrine , 3-o-methylepinephrine , norepinephrine , octopamine less than tyrosine much less than alpha-methyltyrosine , 3-iodotyrosine much less than homoveratrylamine .
C0013030
dopamine
C0011498
methyldopamine