catecholamines interact with a typical beta-adrenergic receptor , i.e. , the order of potency of catecholamines is isoproterenol larger than or equal to epinephrine greater than norepinephrine greater than dopamine , and propranolol is an inhibitor but phentolamine is not .
C0007412
catecholamines
C0028351
norepinephrine