when affinities of compounds in [ 3h ] neca binding to a2 receptors were compared to their affinities in [ 3h ] n6-cyclohexyladenosine binding to a1 receptors , n6-cyclopentyladenosine was the most a1-sensitive agonist ( a1 ki , 0.59 nm ; a2 ki , 460 nm ; ki ratio , 780 ) , whereas the selective coronary vasodilator 2- ( phenylamino ) adenosine was the most a2-selective agonist ( a1 , 560 nm ; a2 , 120 nm ; ratio , 0.21 ) .
C0050789
neca
C0001443
adenosine