the relative potencies of adrenergic agents to displace [ 3h ] prazosin revealed a typical alpha 1-specificity : wb-4101 = prazosin greater than phentolamine greater than dihydroergocryptine much greater than yohimbine greater than propranolol for antagonists , and l-phenylephrine = l-norepinephrine = l-epinephrine greater than l-isoprenaline greater than d-norepinephrine for agonists .
C0014563
epinephrine
C0028351
norepinephrine