the binding of 3h-dihydroalprenolol appears to be specific for beta-adrenergic receptors , since adrenergic agents displace this radioligand with the following order of potency : propranolol greater than or equal to isoproterenol greater than or equal to epinephrine greater than norepinephrine greater than or equal to phentolamine .
C0014563
epinephrine
C0028351
norepinephrine