the rank order of potency for antagonist inhibition of binding was yohimbine greater than prazosin = phentolamine greater than chlorpromazine = corynanthine , whereas the rank order of agonist potency was oxymetazoline = clonidine greater than or equal to uk-14,304 greater than or equal to ( - ) -epinephrine greater than ( - ) -norepinephrine .
C0014563
epinephrine
C0028351
norepinephrine