the rank order of adrenoceptor antagonists ( yohimbine greater than phentolamine much greater than prazosin ) and agonists ( uk-14,304 greater than clonidine greater than ( - ) -adrenaline greater than ( - ) -noradrenaline greater than ( + ) -adrenaline greater than ( + ) -noradrenaline greater than amidephrine ) to compete with [ 3h ] ( - ) -adrenaline binding showed that the labeled sites were alpha 2-selective and stereospecific .
C0014563
adrenaline
C0028351
noradrenaline