adrenergic ligands competed with [ 3h ] hydroxybenzylisoproterenol binding with the following order of potency = ( - ) -propranolol greater than ( - ) -isoproterenol greater than ( - ) -norepinephrine approximately ( - ) -epinephrine greater than greater than ( + ) -isoproterenol = ( + ) -propranolol , which is consistent with binding to beta 1-adrenergic receptors .
C0028351
norepinephrine
C0014563
epinephrine